thanks strager. 

Have you checked how many essence you have before the battle and after the 'dodging'? There is mention about using 'powers' to escape the killing blow.

I think you lose some prestige if he makes that escape as well, but since prestige is relative to the city I don't know how it is managed. I haven't died that much since I mostly sit in my base teching up and spamming archers. A lot of features are missing so 'the escape' and its details could very well be one.

I lost a Sovereign when i attacked the enemy stack with several heroes in it. So maybe his death is just a random thing.

Hmm, i have no idea. I didn't look at it.