Bj,
With the A/T engaged its the computers that move the thrust levers and not the other way around.That....I hope should answer your query.
IF for some reason the thrust lever is forced into an uncommanded position(as in maybe held into a position physically),the levers sense the 'suggestion',inform the computers and if nothing changes for a given period of time,they go into a "soft manual" mode or 'Thr hold' position.Wherein all protections are still available,but the levers would stay in the last commanded manual position.
Hope this helps....