Your unit can, if you've trained enough, teleport(almost working :S) and, if you have weapons etc with you, can change into other characters. It is also(almost done) possible to switch body's with a enemy and some more of that kind of stuff. I don't think this will interfear much with the burrowing stuff but the blinding with the medic would cause some problems I think. Coz you constantly have to teleport the unit to a medic and when it is blinded, which takes about 2 secs you said, teleport it back again.... That's imposible when you're going on a body changing frenzy, or even when you do it once....
Will the burrow unit trick slow down the unit much ? Is there a other way ?
I'm currently extreemly bussy with school, starcraft, maps, etc. So I don't have much time to think of something by myself, I've more importent triggers to get working
Thx for all your comments, I just got a cool idea

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@Zerg Playing Dead: I already thought of that (that you don't see anything) for using in dungeons and stuff, but I'm not going to use it outside.... It would be a really iritating spell for the enemy thou

ADDITION: Hmmm

, teleporting is off the list

it works way to slow

it looks like body changing is only going to be for special situations, but it's still going to be fun

IF it works....