Whenever I watch pro play, they always crouch while taking duels with and against rifles. Why do they almost never tap&strafe / burst & strafe. My guess is that they probably do it to change the head level, but they don't do it as often in...

Honestly, I'm divided whether I enjoy icebox. Sometimes I like it, sometimes not. But most of the times I definitely lose. Since I'm not a fan of selecting maps, I know I have to play every map eventually. But I have no clue how to approach...