The lost Diamond

Chapter 2

About half way to school still lost in her thoughts about school and boredom in general, Lisa saw Two people running towards her.
One of the guys was holding a gun and seemed very angry while the other one rather threw a fearful look at her.
When they passed by her the man that was being hunted quickly put something sharp in her hand.
Lisa was so shocked that she didn't even feel the pain in her hand. She was squeezing the little thing the man gave her.
She simply followed them with her eyes while they ran faster down the road until the first guy tripped, The other guy getting closer raised his gun and pulled the trigger killing the first guy in an instant.
The gunman reached the dead body and quickly checked all pockets but didn't seem to have found what he was searching for.
Shoot. Me. Or... Don't. Rather don't. Wait. What if...
Lisa held her hands tight to not drop the sharp thing, even though it still hurt her hand. She stared at the man while he at first stared down on the corpse then slowly turning his head into Lisa's direction.
She slipped whatever it was in her hand quickly in her pocket and decided to just go to school and pretend as if nothing of this had ever happened.

In English-class she had to think about the gunman and almost forgot that she had this ... Something waiting in her pocket. She carefully looked around if anybody was watching her. Like usually, nobody did.

Why am I even looking if somebody is watching me? I'm in the corner of the classroom! Lisa thought amused while she finally took out the thing in her pocket and looked at it.
Suddenly the school, her class and everything around her was even less important to her after seeing what was lying in her hand now.
She couldn't believe her eyes, in her hand, she was holding a big see-trough diamond!

"Ok what is the past form of 'hit'? Lisa?" Miss Seaver looked at Lisa smiling when she saw that she wasn't paying attention to the subject. The whole class turned around to see how she was doing. "Lisa?"
Lisa looked rapidly up and was very scared. "Would you please put away your toy?"
Lisa put the toy as miss Seaver describing it, in her pocket while some kids in the class were starting to giggle.
Miss Seaver looked at Lisa while her smile changed into an evil grin.
"With 'put away' I meant 'give me'. You know that right?" Lisa looked shocked at Miss Seaver.
"You can have it back at lunch." Lisa still stared shocked and scared at Miss Seaver. "Give. Me. The. Toy." Her grin disappeared now too.
That was the moment when it was too much for Lisa. "No!!" she screamed and ran as quick as she could out of the classroom, her face filled with anger.
She ran down the hallway while looking over her shoulder. Then Lisa ran against something, or rather someone and fell to the ground.
"well well... Look who we have here... Shouldn't you be in class?"

(Ok Thats it for today!
Any ideas who the person could be? ;P

Well, i wrote this after just 7 hours sleep at 1 PM.

Have a nice day and stay excellent!)