Allen's perfectly fine with that. One of them knows what to do, the other can get it done, everyone benefits from the results. It's a good arrangement. White eyebrows knit at the instructions given, but it's not a troubled frown, just one of careful consideration. Precision isn't something he often has to concern himself with when unleashing Edge End, but he's sure he can manage it. Besides, he reasons it won't have to be too precise. They can always start with a pit that falls within the dimensions specified, then hollow out the edges to fit.

Once that's worked out, he straightens and Invocates without further ado, white rippling down his shoulders into a full, furred cowl. The nod he sends Karkat's way (mildly abashed, as though apologising for not warning him first) after the Invocation is almost an afterthought ― Karkat has already seen feathers sprouting from his arm, nothing gets weirder than that.

"You might want to stand behind me," he suggests, gesturing at Karkat with one long talon. "In case it gets messy."