Did she use something like one of these?
Allegedly, it will do 400 sheets of 20-pound paper at a whack. Dunno how many sheets equal an arm.
On the downside, it "comes with multiple safety features".
Years ago, part of my job was operating something like that. The one that we had was no-foolin’ serious cutting power. I don’t doubt the claim. You’d initiate the cut by simultaneously pressing two red buttons that were on opposite sides of the machine.