I'm sure Mr. Yramrag knows this by now, but for anyone else curious, this is actually the standard behavior - the units do struggle to decide what to do and then just go stomping around because they can't attack the flying hero. I also agree that I feel like I don't ALWAYS see that behavior, but I might be thinking of older game versions. To reduce the stompy damage, which was pretty significant, city walls do help, but he could've also focused down a single unit to reduce the # of units counted as inside the city at the end of each turn. Since his melee is stronger than his ranged attack, he might've also wanted to burn up all his mana on the biggest spell he could, then go toe to toe with everything. (It's a shame you can't just issue a direct melee command - there are several caster/fighter heroes who may well end up with better melee weapons than their magic attack.)
Also, the funny thing about that "surprise attack" with the angels is, that stack was actually visible in the last video, but you were too intent on taking the city to notice it I think :) As with the Chaos node of course, it all worked out fine! Superheroes OP.
