As soon as Katniss suggested breaking off, Jaina started to shake her head. That quickly turned to nodding when Peeta told her to wait. The way she figured, if they still had others outside their alliance to worry about, they'd stand a higher chance of getting attacked again if it was just the two of them. Pick off the others first, then break off and it'd be everyone for themselves.
Re: Break from the pack, KatPee!
Jaina really didn't like thinking this way.