I personally focus on eliminating one of the enemies, and then me and my partner decides who will 1v1 the opponent first, and i sit it out, as sly cooper, i basically get called in if their AP gets too high, and he sits it out while i drain their AP back down and finish the fight. sometimes, if me or my partner are in a hurry, we double team but never talk trash to the opponent, unless earlier they teabagged or talked trash, then they get ground up and stepped on, aside from that we explain we are in a hurry, finish the match and move on. have i run into people that 1v1 me? not often, usually me and my partner finish one of them off before they get one of us, but when i do die on my team mate he usually gets double teamed. cant name any names because i dont pay attention, but there have been matches where they agreed to 1v1 though, a sackboy and parappa agreed after my team mate lagged out at the start of the match, its not really uncommon, but those that dont can be annoying, but they earned the power to show mercy or not.
this happened to me earlier. i was in a random 2v2 quick match. i was sly, i think my partner was toro (can't remember) and the other team was g.cole and jak.
my partner died fairly quickly so it was me against the cole and jak. the cole went to the other side of the stage (taunting and jumping) while me and the jak duked it out for a good while.
i ended up losing (jak killed me with a level 3). but it was pretty good to see that the cole let me 1v1 with the jak for a while.