I also enjoyed the episode and fight, but one thing that bothered me a bit was the scroll... Surely Goblin Slayer isn't/wasn't the first and only person to ever come up with that idea for a bottom of the sea water-laser? Given its effectiveness and lack of drawbacks, I figure most adventurers might each carry their own little WMD scroll for rainy days/encounters. I hope it is revealed that the actual creation of such a scroll is somehow prohibitive, or the lack of creativity on the general pool of adventurers' part I would classify as a weakness of world building.

Still though, that was a small nit-pick in an otherwise entertaining episode.