Not so much an elevator, given their position on the trailing edge of the wing, but more like a flap with limited deflection both up and down. Like flaps in gen

Not so much an elevator, given their position on the trailing edge of the wing, but more like a flap with limited deflection both up and down. Like flaps in general, this would have some effect on pitch, but I doubt it would be enough to make pitch control impossible (or nearly so). My guess is that in this scenario, small angles of yoke deflection would have little effect, and the pilot's almost instinctual response would be to increase that deflection, quickly reaching the point where the spoilers would kick in, giving the sort of roll response the pilot was seeking (together with some unexpected yaw that I suspect also happened in the actual case). It would be a problem, but not quite so counterintuitive and baffling.