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No, no, it's a very interesting point, by the way, for improving your knowledge of the game.
In this battle, as far as I understand, the Rust Dragons were afraid of the Gorgons,
but they needed to fly forward; after all, it's AI.
Therefore, they flew so that the Gorgons couldn't reach them by one cell (due to an obstacle on the battlefield).
Another question: why didn't they attack anyone? :confused:
Here, I think, the situation was as follows:
all the monsters from the hero's army were casting spells, except for the Lizards.
That is, the Rust Dragons didn't want to expose themselves to a spell.
But why didn't they attack the Lizards?
I think the Rust Dragons positioned themselves so that, in case the Wyverns attacked them, they could respond with fire breath (while maintaining a distance from the Gorgons).