The #2 reverser was locked out according to TAM per MEL and legal for this airport. If they landed on speed and in the TDZ if braking action was normal non of this should have happened. It did happen so one of the three wasn't there. Maybe more. If a go around was attempted after TR deployment on #1, which is not recommended of course, the right engine would spool immediately and the left would have to come out of reverse and then start to spool up well after the right engine. The results would probably follow the google earth picture posted earlier which was a well done illustration of what the security cameras showed. I have landed and after stowing the reversers realized the brakes were not effective and would have had an overrun without going back into reverse. Add a long landing and extra speed with one reverser on a slick runway doing training and things can go wrong.