I agree with the folks that voted CC to be the ones yielded. In the previews it shows them being *extremely* frustrated at each other, Colin telling Christie that he quote 'hates her.' He'd only get like that if he knew they were behind, in my opinion. I'd say a team pulled ahead of them at one of those collective spots that the teams get bunched up at, like one of the "opens at 7am" kind of places. Or an airport.
That's my best bet