Honestly I was disappointed with Sombra's appearance. Don't think I'm saying disappointed with him, but he's this tyrannical and evil unicorn who gets five lines, seven minutes of showtime and defeated easily. He had so much potential and is just beaten so easily.
Raven: She drained her energy in a shield, which bought Twilight enough time to get to the Crystal Heart. But that's not very important, is it? Hey, Doc! Can you take us back in time with the TARDIS so that we can tell Cadance that she really doesn't need to form up that shield? I mean, obviously, it wasn't a very important factor in beating Sombra!
Dr. X: Oh, yes. It was absolutely meaningless. There was no purpose for that.