Luka and Lisa walk outside, arguing about the score of the foosball game. He sort of accuses her of cheating, and she calls him a bad sport; he says it's that he can't handle losing to a girl, and then admits that he's joking, and very formally says, "I actually enjoy losing to you, Abby." Aw! Okay, sorry Sars, they are cute. ["Meeee...eee?" -- Little Joe] And unlike Mark & Elizabeth, or Benton & Finch, they actually have a lot of chemistry together. Luka reaches out and takes her hand -- very naturally, in fact -- and tells her that her hands are freezing. He asks if she wants to catch a cab, but she says she's okay: "This is strolling weather in Minnesota." They pass a doorway without seeing a Common Street Thug lurking there; Luka has just finished asking Lisa, "Is that where home is?" when the CST emerges from the shadows and clubs Luka in the back of the head with a pipe. He staggers forward and falls. CST turns around and just when I'm thinking he's about to vamp out, he goes the rather pedestrian route of demanding Lisa's purse. She hesitates out of shock, and he menaces her with the pipe, clutching her by the lapels so that it's actually impossible for her to hand him her purse. Maybe you want to think about workshopping that particular maneuver, Thuggy. As Lisa is frozen in shock, CST is seized from behind and thrown up against a fence. Is it Angel? No, it's the other angel. Of death. (Luka.) Luka throws CST up against the fence again, and then knocks him to the pavement and proceeds to slam his head onto the ground again. And again. And again. Ten times. Each time Luka picks up the thug by his shoulders to throw him down again, we can see a small smear of blood on the ground below his skull -- the smear getting a little bigger with each successive slam. Lisa calls Luka's name several times and finally snaps him out of his...well, murderous rage. Because killing people in a trauma room is fine -- and is, indeed, expected of him -- but killing people on the street is not. Luka stares at Lisa as if he doesn't know her.