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There's a bug, but it only happens on my computer. I checked with a friend, and he doesn't have this effect. It's clear that Susanin can easily kill enemies if they get caught in the mana vortex, but in my game, another hero captures the town. If there were guards in the town, it would be clear how to capture it without getting caught in the vortex, but without guards, I don't know how to capture the town without triggering the vortex.