BST Dragua Solo Strategy

I recently finished the Ulhuadshi stage, and was looking to spam Dragua to get my 75 scales.
I read that Beastmaster can solo this. My BST is decent, however I saw someone say they were using RR/DC/FF atmas on it, with Falcorr Pet.

Which FF atma are they referring too? The addle one? or Mdef one?
They also said they stood back and let the pet kill it, and it took some time. Surely if they just stood back and watched it die, RR becomes useless?

Any tips for this fight would be great, thanks!