That was not a good matchup, despite the numbers.

Symphonic echoes, alone (in my opinion), took away their number advantage as every single opponent Eoria and Kostyan faced had no ability to use non-targetted attacks (or very minimal ones).

It would have been much wiser for one of those shifters to revert and start dispelling after they got distorted (since their melee wasn't going to do shit).

Also, Kostyan and especially Eoria are not going to be easy to pin down, especially by that combination of defenders. One thing I always hate about the Fortress is that no matter how many times you might manage to drive your foes off, they are going to kill that Tara'bal at some point and there is nothing you can do about it. I wish outers had anaconda regen when not fighting (normal regen while in battle).