Richard is watching Cristina as she works and is either an amazing actor or is actually enjoying learning about the laser procedure -- my guess is it's a combo of both -- while Owen watches from upstairs, a bundle of nerves. Something seems to go wrong as the field of vision on the monitor goes red, but Cristina is absolutely calm about it.
The paramedic who was driving comes around the back of the rig and opens up the doors to tell them that he doesn't know what happened to the engine; he called for backup but they are going to take a while since they are in the middle of nowhere right now. He tells them he's going to run the half-mile back to where he thinks he saw a store (note: it is absolutely sheeting rain) and as he throws a couple of cones in the road advises the two of them to get out of the ambulance. Mere argues that they can't take the baby out but they also can't leave her there alone because she'll die, but the dude just points out that the ambulance is on a hill, on a curve (at night, in the pouring rain) and if they get hit, the oxygen tanks inside will blow up. Ominous, LOST-style music accompanies these warnings.
Cristina is surprised and annoyed when Owen busts in to the OR, panicked, asking if she needs help. She points out that there was a bleed and she fixed it -- again, not a big deal if this wasn't Mystery VIP -- and assures him that if there's any sort of crisis, she'll take care of it. They each are thoroughly annoyed by each others attitude but Cristina wins because she's the one with a laser inside a guy's lung. He reminds her that she needs to focus to which she points out that she would be able to focus a lot better if he'd stop inexplicably panicking, and then she reminds him she's on the clock. Richard gives Owen a really pointed look that I like to think says, "Seriously, man, pull yourself together!"
Callie and Jackson are talking to Laura's husband and she explains how a screw came loose, which might mean the bone wasn't strong enough but they won't know until they run some tests. Laura's husband, though, can't get past the initial fact that the screw came loose and was cutting up her heart. Callie assures him that they have the best surgeon working on her in Teddy but admits they won't know what the situation is for a while. He really, REALLY can't understand what she means by, "the situation" -- I would think that deep down he in fact totally knows that means they need to keep her alive first but his conscious self just can't process it. Their little boy, Drew, then asks for his mom and his dad picks him up, which drives the Guilt Knife that much deeper into Callie and Jackson.