Having DMed too much. Nope.
This is easily a rule as intended type of thing. If you hit someone else. Sure fine, this is actually awesome and very creative and totally in the spirit of the game.
If you're just trying to break the game. Nope. RPGs aren't about trying to pull apart the systems in place for a group of friends to have fun. Not at our table anyway.
Even the damage dealt thing is silly. Is argue you cant deal damage to something that is fully damaged.