Well, my only flying experience is lots of RC stuff and from what I have seen, to make that sort of correction I lose lift on the opposite side of of the plane without increasing lift to compensate.  This should cause a drop in altitude.  In this film, the LA snaps and rolls and recovers at very slow speeds.  Look, I am a layman here and I know there are tons of aero guys (I am a geotechnical engineer).  I would love to understand the math behind this LA thing... can you help me out FLS.