about Are you flying a Mirage ... Lemurian ?
The roll rate of the A320 in normal law is 15 degrees per second
That is with sidestick fully to the side. And only below 250 knots because as speed builds up above Va the full authority is progressively reduced. Luckily the A320 which met a glider was at 250 knots and flight level 80 or thereabout.
The captain used full rudder to increase roll rate and that probably helped a lot, but the plane never could exceed 15 degrees of bank per second. Which is quite fair for an airliner.
The problem which could happen (and did not in that case) would be the pilot flying deciding to bank left while the Captain taking over in a reflex action banks right…not much time for a briefing in those circumstances…maybe it is easier when you see those big hairy paws jumping on the yoke, instead of those unseen subtle movements behind the scenes…