on join:
    if {teleport.%player%} is not set:
        set {teleport.%player%} to 0
        stop

on shoot:
    if shooter is player:
        if projectile is ender pearl:
            if {teleport.%shooter%} is not set:
                set {teleport.%shooter%} to 0
            add 1 to {teleport.%shooter%}
            stop

on entity teleport:
    if event-entity is player:
        if {teleport.%player%} >= 1:
            cancel event
            make a fake explosion at event-location
            remove 1 from {teleport.%player%}
            stop