Improv: Doesn't really matter, if they use an opener or not they will still end up in a position where they need to setup in order to do their next move, if you're against someone that you know will do an opener or is going to do rush move, go backwards. Easiest solution, just go backwards.

Comebacks: Yeah, it's fairplay, plus it gets a little boring if you get points in the first few frames and just tripod or stop yourself from DQing, I'd rather comeback and beat up the other opponent since this is Multiplayer not Singleplayer, more fun since it's a challenge thinking about what your opponent will do next and how hard you can attack him and destroy him (sorry if I offended you Uke, you are the greatest ever).