on quit:
  clear {targetingplayers::%player%}

on tool change:
  wait 3 ticks
  player's tool is light gray dye:
    if {targetingplayers::%player%} is not set:
      set {targetingplayers::%player%} to player
  else:
    if {targetingplayers::%player%} is set:
      clear {targetingplayers::%player%}

every 5 ticks:
  loop {targetingplayers::*}:
    name of loop-value's tool does not contain "laser target designator":
      clear {targetingplayers::%loop-value%}
      stop
    distance between loop-value and loop-value's targeted block is more than 3:
      make loop-value see loop-value's targeted block as redstone block
  wait 2 ticks
  loop {targetingplayers::*}:
    make loop-value see loop-value's targeted block as loop-value's targeted block