Wild Bill, who was standing on the opposite side, told him to stop.

At that moment Tutt, who was carrying his revolver in his hand, fired at Bill but missed him.

Bill quickly pulled out his revolver and returned the fire, hitting Tutt squarely in the forehead and killing him instantly.
Quite a number of Tutt's friends were standing in the vicinity, having assembled to witness the duel, and Bill, as soon as Tutt fell to the ground, turned to them and asked if any one of them wanted to take it up for Tutt; if so, he would accommodate any of them then and there.

But none of them cared to stand in front of Wild Bill to be shot at by him.
Nothing of course was ever done to Bill for the killing of Tutt..