That thing you did with your mouth

It doesn't feel like I haven't posted here in ages, because I have been working on fannish stuff--it just cannot be revealed at the present moment. (Cue foreboding music.) In the meantime, here's something I've never understood about the buddy breathing scene in the "Mountie on the Bounty" episode of Due South.

( paraphrased, from memory )

My question is, why does Fraser correct himself? What's he about to say--"in a jam"? Why does he rephrase?