General discussion about Heroes of Might and Magic II.

Yesterday, I witnessed a very strange bug, or maybe I just never encountered it before. I was playing as Mountain King for the Knight (again, I didn't build Swordsmen on day 1), and on days 7 and 8, I took the right and left Castles, almost dealing with the remaining heroes from those factions. Around day 10, my hero finally started clearing out the bottom Castle. I noticed that a Sorceress from the upper Castle was standing with a decent army near my left Castle. I reloaded the autosave; she wasn't anywhere nearby, and the map was mostly open, allowing a hero with an army to move quite quickly. She didn't have Dimension Door (her Castle only had level 3 on day 19), and she wasn't leaving Boots behind. In short, this unexpected "gift" certainly prolonged the game. When I finally managed to defeat her with a Beaver after sending the left Wizard and Warlock to attack her (thankfully, the Beaver was smart and built a level 2 town, but it only had cold-based units), I was left with 1 Ogre and about 20 peasants.
It seems that either the Sorceress was invisible on the previous turn or she somehow teleported to the Castle using some clever method. I didn't see her move; it was just a shadow, and then this "gift" appeared. Is that even possible?
I checked Teleport for the Yellow faction – I didn't have enough money twice to buy Dragons, and the second time, I was only a little over a thousand short. This was assuming I only took two heroes to their home Castle. I was afraid to go to the Blue faction; it wouldn't be easy for Ilia.