Originally Posted by VSportsGuy
It's an oldschool tactic where you cover the mask and tilt the head down to get a bounce off of your hand. If you have a break on your arm, your slide has the potential to wipe it off as well.
This, 100%. It's giving yourself the opportunity to cheat a hit on the break if you take one. It became fashionable for a while, then it trickled down to divisional and local players, then it went away in the pro ranks when refs caught on but it's still something some players do because they saw Joe Pro do it on a video from back in the day and he's the coolest guy to ever pick up a paintball gun.