1. Why was his weapon a baseball bat? Did he have a damagehack and this is to avoid automaticban by damage per hit?
2-. I dont play hardline. Is there some kind of damage penalty for wallbanging? Did he use a damagehack or were those shots possible and the complete map is made out of cardboard?
Some old BF2 hacks "killed" with a ammo pack. It's probably to avoid anyone (and automated cheat/stats analysers) looking too closely at his stats. "So he has 100% hit rate with a baseball bat?"
Probably damage hack on top of it all.