Isaac when...he had attacked the guy that had been bothering you. He was upset that you hadn't told him about it but rather he heard from Boyd. After the two of you fought, you saying you had a handle on the situation, Isaac went and found the guy, picking a fight he knew he couldn't stop. But when he heard your voice he snapped out of the trance he had been in and slowly looked up to see your reaction.
'Isaac!' you had called as you ran over with Scott. 'What are you doing? Stop!'