I killed Lone doing the same thing SG did.. 2 peons. Rep Cannon. Chop each direction top of 9. lasted 2 minutes. Guess he figured out how to defend against it.
Not sure how many peons sg repped rax with. I did first 2 available before smith. Might have been the deciding factor. That rax at 9 damn near fell. If he only used 1 peon to rep the rax at 11, 2 repping would have given him the extra/faster grunt needed to open 9 up.