Retreating and dying. Is this a bug or my ignorance ?

[Stelteck]

Hi.
I just had a battle where i lost some of my super combattant while retreating of map. I do not understand why.
I need expert advice.

I use dominion patch 3.28 CBM 1.94

It is a huge battle between me, arcocephale and palata. I'am loosing badly. It is normal.

First part of the battle, for information :
https://dl.dropbox.com/u/64073834/battle1.avi

The second part of the battle focus on the behaviour of my SC during retreat.

https://dl.dropbox.com/u/64073834/battle2.avi

At 1:00 of the video, we can see 3 of my SC :
GroStelios, my cyclop. Flying with boots. (He is top right)
King water troll. Middle of the screen. He is walking and running away.
King troll, flying with boots, fighting in the middle left. (The orange troll).

at 1:05, the message : "the army of arcocephale is routed"

immediatly : King troll and GroStelios disapeared. My opinion was : They ran away flying and immediatly left the map.
water king troll run away too, but it will be slower as he walk. He managed to leave the map at 3:46.

End of the battle. This is the result on strategic map :

GroStelios the cyclop is DEAD.
King water troll is DEAD.
King troll is alive on a neighbouring province.

I really do not understand why king troll is alive and not the others.

I thought retreating always succeed if there is friendly neighbouring provinces.

Anyone have an explaination ?

Thanks for your help.