Bubba and Joe are in Bubba's backyard sharing a case of beer.Bubba tells Joe he recently came into possession of a bulletproof vest.He fetches the vest, and Bubba and Joe, in their infinite wisdom, decide to find out whether the vest actually works.Bubba produces his semi-automatic .22 caliber rifle and Joe puts on the vest.Bubba then shoots Joe in the chest with one round.The vest absorbs the round but Joe is left with a really bad bruise.The police find out and come and arrest Bubba for battery.Joe then sues Bubba in civil court for battery.

What defense to the crime of battery might Bubba have?

What defense might Bubba have to Joe's tort claim of battery?