Simon was in a rush trying to hide himself after what looks like to be a murder scene of a mundane, he didnt wanna be caught or linked because he didnt mean to do it, he wasnt the same boy anymore, he was broken..and hurt and honestly lost because his best friend didnt even remember him because of false assucations, it broke him and it changed him..so when he accidentally bumped into someone he panicked and bared his fangs at him

"GO! I DONT WANNA HURT YOU! PLEASE I SUGGEST YOU RUN!"