killer

rednet.open("right")
local place = 0
local function moveTo()
  turtle.down()
  turtle.forward()
end

local function moveFrom()
  turtle.back()
  turtle.up()
end

local function check()
  while true do
    event, id, text = os.pullEvent()
    if event == "rednet_message" then
      if text == "KILL" then
        if place == 0 then
          moveTo()
          place = 1
        end
      else if text == "BACK OFF" then
        if place == 1 then
          moveFrom()
          place = 0
        end
      end
    end
  end
end


local function attack()
  while true do
  turtle.attack()
  end
end

parrallel.waitforAny(attack, check)