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 ranked games, in compare to pro tournaments. In the tournaments they almost crouch every fight, but in ranked (for the ones I've played with/against) they go for taps more often.