Escape seems to have some problems (both the spell and the scroll).
Right after using Escape, your army often reappears on the strategic map right on top of the enemy. That is, your army and the enemy army sharing the same tile, one of them invisible.
Also, using the Escape Scroll can bring your mana below zero (the scroll seems to use mana just like the spell). Having negative mana allows you to cast tactical spells without limit, as reported here.
Sorry, no save game, but it should be easy to reproduce.
