Ghostduh
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If you stand directly in front of a berserk dragon with a two-tile-sized creature (in this case, a cavalry unit), the dragon will skip its turns until the berserk effect wears off, i.e., for 255 rounds.
Thank you very much, I checked and it WORKS!!! So, this turns out to be a huge BUG after all!!! Wow!!! I didn't know, I didn't know... I wonder if map creators intentionally design BATTLES like this, knowing about this bug??? Here's another one I found in the HotA patch notes: Fixed a bug where a flying creature would skip its turn when trying to attack an enemy within range but blocked by obstacles. I wonder if this is what I'm thinking of, i.e., did they fix this bug in HotA???
Added 6 minutes later
By the way, here's another question, sorry for the off-topic, but it's a similar bug: it concerns the bug with "fake burning" of dragons, which I've heard about. No matter how many times I've tried to do a fake burn myself, I've never been able to do it. So, the question is, how do you actually do this fake burn, so that you can use a single unit and then the main stack, and the dragon will only burn the single unit, while the main stack will be affected by the burn?)))