Ok, who threw the fucking rock!
When I received my first bleeder from a gas sniper rifle I decided to buy a gas sniper rifle. When I gave my first bleeder to someone else I decided to go back to an AEG. The bleeder I received was from a former military person with tonnes of experience but the KJW mark 1 Carbines aren't incredibly accurate and his shot pegged me in the forehead from about 25 feet. I had the same problem when I was playing but I can't blame the gun (KJW M700). I aimed for the guy's chest and he happened to duck as I pulled the trigger resulting in the bb nailing him in the top of the head.
Regardless of who/what is to blame, it's no fun when people start getting hurt and I voluntarily chose to switch back to an AEG. Some fields/clubs (including NIA games in PG) expect you to stop using a hot/upgraded gun if you cause someone an injury. This is intended as a safety rule not as a punishment. Maybe it was the wind, maybe he crossed in front of your line of fire but regardless of who/what is to blame; it has become unsafe to use that gun at that particular time. Maybe next time you're out the game will be more spread out or there won't be any wind and it'll be safe to try it again, but for that particular day the gun has been deemed unsafe.