on break:
event-block is any log
cancel event
drop 3 of event-block at location 1 meters above event-block
set {_i} to event-block's metadata value "BH"
set event-block's metadata value "BH" to {_i}+1
if event-block's metadata value "BH" >= 3:
set event-block to air
delete event-block's metadata value "BH"