"-oh." Donnie's expression wavers into disappointment for all of a split-second before he gives a shrug of acceptance. Fair. "Well I guess I should have expected as much... anyway, congratulations, you have a functioning motor so far as I can tell."

He holds a hand out towards the structure, still well out of range to really touch it, but he's trying to see if there's any heat build-up since the thing had been turned on. That's something he can better gauge with his goggles, which he tips down as he directs his attention back towards the motor itself.