well, congratulations all of you guys that beat this wall :)
did you see that sign says NO COMMANDS?
it works with a dray bomb but you could also just use the property drawing tool (set TYPE=NONE)
Okay if you hate my solution so much (it's not a shredder) here's a different design, made especially for this wall id:3214155
my 20px DRAY bomb cuts through this like cheese