If you saved while you play the game then the replay will get messed up... in the replay I saw both hydras and 3 zerglings die, then there was just one zergling left doing nothing... I don't think those were your original actions.
If you're making the map you may want to fix the typo Celebrate to Cerebrate too. It seems like a typo anyway.
But about what you were saying, were you talking about how when a bunch of units which were burrowed over top of eachother unburrow they start to spead out and can even climb over walls.
One time I made a really tight pit and filled it with burrowed zerglings then made them unburrow, they started doing crazy things, but I don't think it worked after some of the newer patches.
It would be good for a Starship Troopers map where the bugs start to climb over the wall
