Skriptで与えたダメージのdamage causeを変更したい

on place:
    if {Chosen_wolf::*} contains player:
        if player's tool is creeper head item:
            send "{@prefix} &a地雷を設置しました。"
            set {_TNTdmg} to new damage source with type "ENTITY_EXPLOSION"
            set damage source attacker of {_TNTdmg} to player
            loop 1000 times:
                wait 5 tick
                if "%block at location of event-block%" is "SKULL":
                    loop all entities in radius 2 around location of event-block:
                        loop-entity is set
                        loop-entity is not arrow
                        {Chosen_wolf::*} does not contain loop-entity
                        {Chosen_mad::*} does not contain loop-entity
                        {Chosen_fan::*} does not contain loop-entity
                        damage loop-entity by 50 with damage source {_TNTdmg}
                        send "{@prefix} &c地雷が発動しました。"
                        set block at location of event-block to air
                        stop loop
                else:
                    stop loop