I know that when you stab with a 2h and bounce you can instantly strike again. I never saw anyone pulling this off with a polearm or a 1h.
I do (read:did) this with a polearm very often, but it requires some thought.
You can't just do it with any bounce, you need to bounce really early in the attack animation but not instantly because then your character gets stunned.
When your character does one of these special bounces there's a distinct sound. I quickly learned to listen for it when fighting competent duelists.
Learning how to do it takes a little time, but it's not that hard. Learning to recognize and defend against it is even easier, just keep your cool and anticipate it.