Yeah, he basically just waits it out. I guess that's you mean by pacing, since it happens to expire under Stun.
I also like how his second PF Full Burst just casually crushes my burst records. My PF Full Burst Water team against Ult Fire record is 9.2m, and this is most likely 4x Crit procs (doubt it was 5x) and Fafnir who gives me a free ~800k Burst damage (with elemental advantage). So not only does his base stats cover up for that 800k, but also the 20% from the Crits. Nice.If you can clear Ults, 3k. If you can't, well, best not waste your resources on Jewels, grab the SSRs available so that you'll get stronger for the next Advent.