Iron Fist doesn't stop Thor Ragnarok's power gain?

Just as the title said, I used Iron Fist's heavy on Thor Ragnarok while he was generating power (20 hits) and it did not stop him from gaining power. Is this working as intended?
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Comments
Probably cause of stun with pacify on sp2.
It would bee better to use storm because of the amount of dasmasger that can be done
I’m just saying it’s beetter by how much damage it does and it stuns him as well.
Flow of "energy", not flow of "power". Energy moves you from node to node. Power is used for special attacks.
Also, it says it nullifies cruelty, fury, and precision. Nothing in there about "power" aside from his (not-so) powerful chi.