Wow, that was cool. I'm glad I got around to checking back in (ah, there's RSS! That makes things easier!); I was several posts behind.
So...is Gres Grekis a new PC, a lasting GMC, or a fleshed out NPC?
Also, was the explosion a special effect of the big ugly finally taking lethal damage, or did the transposition (which, I'll note, put equipment inside the critter whereas its usual approach was to strip its victim before swallowing them) end up either directly or indirectly having an unexpected effect? (ie, either indigestion, teleporting critters made the big ugly sad, or just weapon damage is much higher from inside the critter?)