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this is a different ability, which is much weaker than that of the dwarven warriors.
Description: "Yetis possess extraordinary abilities, respond to all attacks, and are also capable of preparing for battle while moving towards their opponent, increasing their 'Defense' parameters." I can't take a screenshot; BindDM doesn't allow for a non-full-screen mode (prtScr also doesn't work), and this is hidden in the abilities (as is the infinite counterattack) - it says undead, large creature, devastating strike. There is a range of 1/2, but there are no ranged attacks; it's likely that it can throw goblins, but it's not written anywhere, and most likely all of this is hidden because it doesn't read from the data.
In fact, this ability is much weaker than the dwarves' ability for the defenders. And these yetis are not stronger than astral dragons, despite their description.