Context
The trusted helper/vampire slayer is revealed to be evil and wants to join the vampires, but they didn't take him.
The heroes are running from the warehouse that the vamp wannabe set on fire (its by the sea/river/ocean) to kill them. He doesn't know the main hero made it, he thinks its just the weak side kick, but hero is hurt and was sort of hidden on a ship as they tried to get away or something.
Also, vampires get claw-like fingernails that they can sheathe, like cats.
Kyra=sidekick Charlotte= main
Basil= villain"Kyyyy-raaa," called Basil in a sing-song voice, "I know you're up there! Just let me kill you, all of your friends are dead, anyway!"
"No, we will never stop! Vampires may be evil, but they're nothing compared to you!"
"Sorry Kyra, but you're all alone, and even if Charlotte was here, she wouldn't do anything!" bragged Basil as he started climbing a rope to the ship.
Then Charlotte stepped out of the shadows and stood above Basil.
"You know, if I was Charlotte- Oh wait, I am!- I would cut this rope and you would fall down to the water," Charlotte threatened.
"You wouldn't, this rope is two inches thick, you can't cut it, and even if you could, you wouldn't, because you're a good guy," Basil bragged, with a smug look on his face as he continued to climb. He was two-thirds of the way up already.
"Watch me." Charlotte took a step back and felt her fangs grow, her claws unsheathe, and the familiar rush of strength, speed, and agility.
She sliced through the top of the rope with her claws and went back to human just as Kyra turned.
"How did you do that?!" exclaimed Kyra, not having seen her become a vampire.
"Just my handy dandy knife," joked Charlotte, "Now get us out of here!"