Ouch, that had to be a bit disappointing. I'd be pretty scared about taking a $150+ dollar camera out to a paintball field without some sort of protection
I saw a buddy of mine have his contour hd lens blown apart by a paintball.. Walked off the field with a hand full of parts. That looks like a pretty stellar
First thing you need to do is diagnose where the problem lies.
If you hold the trigger in all the way, does the leak stop or does it sputter?