Left 4 Dead Rock skeet training

NOTE: I M A COMPLETE NOOB SO DONT TAKE THIS VIDEO SERIOUSLY. Just some training I pulled out in SP mode. I am a complete noob at the game, and its hard to find someone to train with, yeah. The purpose of that training is to skeet rocks in different situations, thats why I didnt dodge the tank. Not sure if it s me being too slow and suck at shooting or the rock tend not to be broken in close range. In order to skeet a rock with pump, I need to keep a medium distance with the tank, a bit further if hr br, br,