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Bone Giant Charges

Attacks 5 times, hits 3 times, wounds 3 times, attacks 3 more times, hits one time, wounds one time, attacks one more time wounds one more time, fails to it.
5 wounds
Infantry attacks back
Bonegiant does a thunderstomp attack
hits 4 times, wounds 4 times...

Rolls to wound again with 4 more dice? Wound 3 times, roll to wound again with 3 more dice?

RAI would seem to suggest that you only get to use unstoppable assult on the bonegiants attacks. But RAW is: Any wounds that you get in the first round of combat, you roll to new attacks with and you keep going until you run out of wounds.

I think this is in the FAQ.

Q. Does a Bone Giant gain extra attacks from wounds caused by its
Thunderstomp special rule? (p31)
A. No