A calling to the ring.
Following my post about Gladiatorial combat, there is another discussion about boxing going on.
If a boxer dies from his injuries should his opponent be charged with murder?
Not a chance.
The victim willingly entered the ring knowing the risks involved. These days, a boxer has no excuse of saying the risks are not recorded, as there are extensive writings on the injury risk of stepping into the ring.
The only possible exception is if a fighter spotted someone in the crowd who was not prepared to fight and called him to the ring.