Broken Warrior

It was a harsh fight, spears flew and blood was drawn; shrieks and battle cries were heard all throughout Waterfall. Their echos penetrated the stone walls and could be heard clearly in Hotlands and Snowdin.
Undyne was a vigilant, powerful warrior, head of the guard and trainer to one of the few other Boss Monsters, Papyrus.
This fight was supposed to be her most awesome yet, and still ... she lost. The Human had taken her down, and she was left to brood, her blood boiling from her fury.
Her attacks had been constant, her defence impenetrable, and yet she was left to her thoughts as Frisk made their way through Hotland, due to meet with Alphys and Mettaton before coming face-to-face with King Asgore.

Undyne growled to herself as she sat in the corner of her house, her head in her hands as she scraped her spear against the carpet in anger, tearing the fabric with its sharp edge.
She couldn't believe it. She, Captain Undyne of Asgore's Royal Guard and sworn protector of Monsterkind ... was defeated by a Human.
She felt undeserving of her title now that she lost to the one thing she had sworn to kill. She would have cried, if not for her burning DETERMINATION to stay strong.
She felt broken, how would the other guards feel knowing that their Captain was a failure? She barely knew how to react to her own emotions. This wasn't like her; she was strong, brave, powerful, DETERMINED. But now she felt like nothing. She couldn't bring herself to call Asgore to tell him the news, she couldn't bring herself to call Alphys to ask her for emotional support. Her thoughts ran riot through her head, tearing apart the pieces that kept her together.
She didn't know how long she could stand for this, sooner or later, she would find that runt again. She would make them pay, painfully.
She was a warrior, she couldn't let herself fall like this to a mere child, could she?
Well she did. That was the end of it, the simple thought of it brought her spirits down, and she placed her head in her hands.

The battle played back in her head, filling her mind with her defeat again and again...

"Don't you see, Human? I won't let you pass!" Undyne held strong, her spear glowing as she stood before the small child. Frisk was ready to run if needs be, and had already done so multiple times now. Undyne swung her spear, turning their SOUL a bright green, preventing their escape while she threw more spears at them with speed.
Frisk deflected many of the attacks, but still got hit more times than they had wished before their SOUL was let back to a deep red. They ate a Nicecream on their turn, restoring their HP to full, and smiled at Undyne, who let out a powerful battle cry.
More spears came, but this time no hits were taken by the child, and they fled when it came back to their turn. "Hey! Get back here!" Undyne yelled as she quickly gave chase.

They ran to Hotland, getting a call from Papyrus halfway through their escape. He shouted down the phone with a gleeful tone, asking about meeting up with them and Undyne sometime soon. Frisk sighed, but agreed happily before he hung up.
Undyne had caught up by the time the phone was down and attacked with rage, initiating another battle. Frisk dodged and ate, fleeing once more to run deeper into Hotlands.
They ran up to Sans's sentry post to find the Skeleton asleep once more, sockets closed as he snored away, mumbling quietly. Undyne noticed this, and stopped for a second to look at him as he slept. She growled at the Skeleton in agitation before proceding to chase the Human that was now halfway across the bridge leading up to the one water fountain that the Hotlands had.

Undyne felt heavy, the harsh heat bearing down on her armour like a weight that even she found too heavy to lift. She stumbled for only a moment, but soon tripped and collapsed on the hot, dry ground with a grunt. She groaned, attempting to push herself up, but all her strength was lost as she slowly burned inside her armour from the battering heat.
Frisk watched her fall and, like the kind child they were, went to the water fountain. Undyne struggled to look up and watch the Human proceed to the fountain. She was enraged, she thought the Human was going to stand there and drink to spite her, watching her with that unchanging expression ... but no. The Human, cruel though their species was, filled a cup and walked over to the large, intimidatingly powerful Fish Monster that laid weakly on the ground, and poured the water onto her head. The fresh, cold water dripped down her fins, soaked into her hair, and made its was through her armour, cooling her down significantly.

Undyne grunted as she found the strength to stand and, once she managed to, look down upon the child that had just helped her. She felt uneasy, this wasn't supposed to happen ... she was supposed to win, to take their SOUL to Asgore ... not feel grateful for their actions.
She stood for a second, before growling and running back to the cool pools of Waterfall, and watched from the safe temperature as the Human walked onwards to the Lab.

So here she was on her floor, Captain of the Guard, fallen from the kindness of the species she had sworn to hate, and she despised it. She despised herself for it, she should have speared them like a kebab once she came so close to the pathetic child, and yet she just stood there!
Her anger grew as she stood up in fury and threw her spear, not aiming. It hit the table and broke it once more. This only made Undyne more furious, now she had to buy another table as well.
She let out her signature battle cry as she threw spears in every direction, her only intent being to destroy what lay around her, and she succeeded; many items lay broken around her, glass was shattered, plates broken, and her kitchen was in ruins.
The drawer where she kept the bones that Papyrus brought round for her was also broken, the yellow dog treats lay all over the floor, some broken in half, their bright red ribbons laying torn and scattered around the room. Undyne halted for a moment before coming out of her angry trance and kneeling down.

She contained her anger as best she could and began to clean up.
Perhaps cleaning would take her mind off the battle and bring it to something that she would enjoy more, like cooking, or playing her piano, since once she was done cleaning up and making the place look right she could enjoy those things to their fullest.

While she toiled, she gave a silent apology to the Training Dummy that lay outside her house, and hoped that he would be able to take her fury as she let out her remaining anger later.