If you touch the controls do something positive to fix the situation. Since they forced a full stall they would have been better off both leaving the cockpit and waking the captain to fix things. At least when he arrived at the cockpit he would have something recoverable to deal with instead of what they left him with in the last minutes.
Since AP had dropped out together with the autothrottles when the air data went south, what would have prevented the aircraft from rolling over onto its back, particularly since it had a significant tendency to roll to the right in its ALT2B mode?
Personally I think that PM was aware of PF's efforts at keeping the wings level, and did not feel confident enough in his own abilities to take over faced with his lack of understanding as to why the aircraft was so goosey in roll.
The initial significant roll oscillation stands out as an unusual situation not described (to the best of my knowledge) by the other aircraft that had experienced multiple ADR failures due to pitot icing. The limited training these two copilots received did not prepare them for flight in ALT2B Law.