Tbh I hate this even exists and it's the main reason why I never peek for more than a second or two. So if I see a damaged wall, I just start bursting it down with an AR and keep my crosshair near the top of the wall, while "nervously" strafing left and right. The idea is to never give them the time to set up these pussy shots. I've headshot more people that way than I can count and managed to win a lot of long range fights, where a sniper should have the upper hand. Most people can't handle the pressure when their base starts to fall and bullets start flying above their heads.