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In the latest battles against phoenixes, I encountered a similar situation. Two phoenixes, one slightly higher than the other, with a storm elemental in the middle. Using the Vulnerability spell, I cast Berserk on this trio. The upper phoenix kills the storm elemental, and now it's the lower phoenix's turn, which is under the effect of Berserk, but it doesn't attack the upper phoenix, and they both "assume a defensive position +15 to defense," and they remain like this for several rounds without moving. I finished off the upper phoenixes with elemental magic. The Berserked and defensively positioned phoenixes became a nuisance, like a delayed-action bomb. However, by resurrecting nearby archangels, I managed to remove the poorly cast Berserk. He attacked the archangels himself. There's also an unpleasant bug where, when cloning (especially on the right edge of the map), the clone either doesn't appear or stands in the place of the original, and until the clone is moved, the original cannot be seen.