So, Instabam. Apparently, he has instant potato powers, yes? And, seeing as he tried to kill some of the Reckoners, it's likely that these potatoes had... perhaps, explosive capabilities. I did some research, and came up with what I think is an accurate representation of Instabam's Epic power.
Don't believe me? Personally, I think it's no coincidence that David alludes to "a potato in a minefield" in one of his later similes...