Alex walks out into the rain, on his cell again, but my guess is that he's leaving another message rather than actually talking to Izzie because after a moment, we see the scene from earlier when he throws it into the wall. Mere narrates, "Sometimes, the answer we get just confirms our worst fears.
"But sometimes, it can shed new light on the problem." Everything must have worked out after all because the firefighters are in fact lined up along the hallway when Roy is wheeled out of the elevator after his surgery. He seems much more peaceful than before, and they all congratulate him as he's rolled along.
"Make you see it in a whole new way." Reed is watching the procession when Cristina comes up and asks if April left yet. It's totally characteristic Cristina -- her voice is totally matter-of-fact, not mean, but definitely insensitive and poorly timed -- but Reed both doesn't know all that and probably wouldn't be in the mood for this even if she did. She starts to storm off but then comes back to assert that April was an even better doctor than Reed was, so "just please... shut up." Avery walks up and asks her if she spoke to April, which she didn't. Alex then walks by and after a moment, demands, "What?" from Avery. Avery says he's wondering if Alex is going to hit him again. Alex then does the unthinkable and apologizes, which Avery readily accepts and assures him to forget it since it was a rough night for all.
Charles, who so far I really feel is the big, dumb animal of the group, walks up and comments how stupid it was to miss looking at the airway, Lexie adds that the airway is always first, and Avery calls it med school 101. It marks the first time the two groups of residents have been able to find any common ground, but Reed isn't happy that it's at the expense of one of them and yells that it was a one-second distraction that led to a mistake. Charles adds that they all nearly got fired for that mistake and Avery backs him up: "Nosedive's got a point." Charles agrees before he realizes he's gotten a new nickname, which -- hee! The bickering continues until Cristina, of all people, jumps in to remind them that fixing mistakes and saving lives is, in fact, their job. She calls out Alex for being distracted all week and tells Avery who knows where he screwed up. However, their patients didn't die, so they didn't get caught, and what happened to April could have happened to any of them. Reed visible softens as she sees that Cristina might not be totally awful after all.