############
                         #  'home'  #
 ###############         #[ ]       #
 <- to spawner #         ##D#H#######
 ~~~~~         #           D#H
 #####~~~~~~~~ #           D#H
      ######## #           D#H
             # #           D#H
             # #           D#H
/* total 22 blocks drop */ ...
             # #           D#H
             # #           D#H
             # #           D#H
             # <-kill zone D#H
             #V#           D#H
              DDDDDDDDDDDDDD###

XXXXXXXXXX
X        X
X~~~~~S  X
XSXXXXX  X