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The mechanism is simple – there are many griffons, so they believe the battle is already won. Consequently, they attack those who are more dangerous (in their opinion), with adjustments for surrendering, of course. In this case, the poks are clearly more dangerous to them, as the blocked marks deal very little damage.
Although there is an element of randomness here. In different tests, the griffons attacked differently. Sometimes they attacked not the poks, but the single griffon that stands above the marks. In the third game, they didn't attack the marks at all. In the maximum difficulty, in one of the attempts, they did attack them.
Added 3 minutes ago
Well, try it :). Maybe you'll learn something.
Added 1 minute ago
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I said above that even without angels, the maximum difficulty fell, although with some difficulty.