Hi Julia! We'll leave it up to you, but the call would be tracked back to his ID. If Hei is still around, that would cause a lot of problems given that he'd lack an ID. That said, if Cain wasn't involved in the attack, he wouldn't be at fault for it. He may be asked to give a statement, but that's all. It wouldn't be too difficult to get the NPC medical treatment, as it's widely and regularly available in the city. If Cain left the NPC alone for some reason, he would easily get assistance from someone else.

Please let us know how you'd like to proceed with this!