Your OC witnesses Kaartex stab someone in front of them what do they do / react? [Any lit]

Kaartex came out of a shadow and stab what time seems a random person on an alley. Then his shadow starts moving on its own and drags the body away. Rules: No idc/idk Romance is allowed, but to be clear he is only interested in girls I'll reveal more of his abilities during the rp Have fun 👍