Upon investigating, Vire notices a lot of footprints. If he had paid more attention that time the local ranger was explaining how to TRACK things he might be able to make since of all this, but instead he just sees a bunch of footprints. Nothing else seems out of the ordinary, besides the brainless elf on the ground of course. (The summoned scorpion "poofed" when it was destroyed, as al summon monsters do.)
Ehaism realizes, after seeing everyone's reaction to his question, no one saw any blood on the dwarf.
Then, a loud rumbling sound comes from outside the cave. The party emerges to see Gregor on the back of the wagon full of supplies, starting to ride away.
( The new initiative rule applies here, and Gregor just went. )