Also, for people asking how this is cheating, I'll provide the definition of the word:
Cheating; "To act dishonestly or unfairly in order to gain an advantage" Or in this case "Breaking the rules to better your situation as opposed to others"
By using this feature on all arrows in the game, he is giving himself a direct advantage against EVERYONE, thus it is against the rules.
There isn't any direct rule focused on cheating, however, this would fall under the common sense attribute, "This is not an explicit list, common sense always overrides disputes. Do not come crying "it's not prohibited in the rules" if you invent a new creative way to be an idiot and get punished."
By doing this he has invented a new creative way to be an idiot, now he needs to be punished.