class XORDetonator : XORFaller {

    override fun moved( movement :  Movement ) {
        super.moved( movement )

        if (movement.direction == dir) {
            val next = look(dir).item()
            // Don't explode a bomb if it hasn't finished falling.
            // This prevents a bomb being exploded while in free-fall from a faller
            // also in free fall.
            if (next is Explodes && !next.isMoving()) {
                actor.die()
                (next as Explodes).explode()
            }
        }
    }

}