Whatever stab problems one can think of (technical, inputs), this alone seems not to explain the notable bank angle inferred from CCTV recordings.
Could someone be conceivably as confident, at ~3'500 AGL, as to try to break out of whatever perceived nose-high attitude threat, by positively lowering a wing?
(Indeed a silly attempt to conjecture a subject to the alleged "don't worry" <> "don't do this", in absence of transcript authenticity confirmation, FDR, and ECAM/EICAS picture)