[Jonathan Norris]

ohh and another little timbit (you need to be Canadian to get that), the top arm of their roller claw is actually on a bit of a pivot and has a little piston at the end of it, so when they fire I bet they retract the piston to release the pressure on the ball.

Timbit #2: if you look closely they have another mini puncher on the end of their roller claw which they can use to poke the balls off the overpass. I've only ever seen them use this once, its another shaft in a linear bearing connected to a small piston.