Dani
I tend not to write long-winded posts, but just for you....
What I mean is: when you retard the thrust levers in the flare and discover that one of them will not move, it is instinctive to go-around/reject the landing and take the problem into the air. I think every airline pilot would do the same on a short wet runway with no grooving and an Inop T/Rev in addition. It would not even cross my mind to think about Ground Spoilers logic or autobrakes.. if that lever is stuck go flying again! One in TOGA and one doing it's own thing will get you airborne again. You, on the other hand, suggested shutting down the engine immediately, which I happen to think is the wrong course of action.
TP