Doesn't excuse the fact that Jaina doesn't even try. The possibility of teleporting the alliance troops isnt even addressed at all. The cinematic could have had Jaina try to teleport them out and then have the Legion usurp the spell. Have one of the famous demons standing behind Gul'dan do it. So those demons would actually have done something in the cinematic instead of standing around with their thumbs up their asses.
Jaina could have opened up multiple portals giving the Legion enough of a distraction for the Jaina to port the Alliance to safety.