"Ow! Fuck, ow!" Thomas cried out as he felt the teeth sink in. He started to pull, before realizing that would just tear the flesh, and his eyes widened in horror as he figured out what could happen.

He had no idea how old this guy was. If he was enough older than Thomas, (and at Thomas's age, many vampires were) then drinking his blood like this might give him a control over Thomas that he really didn't want to give to a guy that wanted to run his head over with a motorcycle. Getting his ass kicked was one thing. He could take that. Possibly letting this guy hijack his body, though? He wasn't going to let that happen without a fight.

Using his free hand, Thomas swung his fist at the other vampire's head as hard as he could, hoping the blow might loosen the bite.