Putting aside the fact Acer can't properly sit on a chair anymore...
It worked!!
His sacrifice was worth.
Reading some jap sites, it seems the fight between Thor + Railgun vs Valkyrie + Saint was promising but with a disappointing ending because of the current situation when Othinus appeared, oh, and still has no idea about magic,
.
Now let's see how true are those spoilers.
EDIT:
More and more people are recalling the first meetng and last scene between Birdway and Touma from Styil's SS: