Bug? Rule I am unaware of? Am I just stupid?

[The Panther]

I admit that I have never seen that gateway stone before. I didn't even know it existed, and it is not in the manual.

I learn something new every day!

I am still wondering if the strange retreat behavior had anything to do with the fact that both heroes died in my battle replay. Is the ichytid lord still alive or did he die too? My replay showed him and the pretender escaping along with a handful of slyphs. All draconious died, which matched the battle report.

Also, one other thing. Did all four heores escape alive in your battle replay, Yvelina?