I see this almost every time I play. Some kid runs out of air or paint and thinks he is no longer an asset to his team. In this case it was a two on two. My phantom went down and I couldn't shoot anything. Was I hit? No. My teammate didn't know where the other kid was, I told him. We won.
Moral of the story is just because your gun isn't working doesn't mean you can't be an asset to your team. Do you think if a soldier's rifle went down that he'd be unable to help reach the goal? Of course not. Same thing applies here.