Just a popin, but when Captain returns, he is aware RHS is handling, and "assumes" the RHS data is current and correct. There is no comment to update the Captain of the discrepancy suggested by LHS monitor and switching of RHS Display.
So there are now two Pilots watching and reacting to RHS Panel? That is a tacit vote of confidence in what may be the downfall of the a/c. If reluctant before, now LHS is doubly unwilling to take over, or correct/command the ship.
imho