Because when a wrestler hits the ropes, they launch the wrestler back.
Sort of a poor example, I guess, but it helped illustrate the secondary point - you can explain it easily enough, but no-one ever really does. When a wrestler's thrown to the ropes, he either bounces back or grabs it, and whichever one he does is taken as the logical choice for him in that situation. In the situation I described, you can rationalise it afterwards, but in-story the explanation is "that's how it is". It's just pedantic crap that bugs me enough for me not to just take it like that, not really a writing failure that's worse than anything else going on.
But they didn't jump Abyss, which is part of the point. They stood around, then left the ring. They'd gotten this far in a match with two-on-two against guys called the Genetic Blueprint and the Monster, and when one of them is knocked down and bleeding, they don't press the advantage? If it was a normal wrestling match, then it could be explained as they won the match, they don't care any more. But it was a First Blood match, they just spent however long trying to cut these guys open and vice versa, then the bad blood vanishes once the bell rings? If they'd won via their own hand then it would be understandable, but it's a grudge-style match, and they're letting the grudge slide when they have a perfect opportunity to put the boot in.
Like I said, it's more pedantic than anything else - like asking why winning a wrestling match makes up for someone trying to steal your son or trying to kill you or something. It's wrestling, that's how the story works. It just bugs me.