It paid off, though. The tail crashed through the Icewall—but doing so had slowed it just enough that I was struck with a glancing blow, on the shoulder, rather than dead on. As my body struck the floor, then careened, bouncing back up toward a far wall of the chamber, even though I was in a rather high amount of pain I noticed the adversary wasn't nearly as quick to pursue and attempt to follow up than they'd been at the start of the fight.
I raised Icewalls in their way as fast as I could, getting up five of them. The last of these I expanded enough to block off the Moonscale Serpent from my edge of the chamber completely.
They did not, as I expected, proceed to crash through them with their body. Instead, their maw opened wide as they readied a devastating Light Beast technique, one that I thought wouldn't lose out to the average dragon's breath—if they executed it.