I'd say he knows her fairly well, has a bit of a crush on her. How she views him is up to you, he may just be that guy she's seen around town, or perhaps has talked to every now and then but doesn't have feelings for. Probably surprised by him showing up but as concerned as you'd be if someone were to get attacked like that. I don't know how long he'll be around, but I don't have any plans to kill him off for a little while now. Had she said 'go ahead and kill me' or something along those lines to Luka when asked if she wanted to die he would have been killed just now. So I didn't give him too much thought in case he get killed off. I'll probably work on his character over the next few days.