[The Giant]

Originally Posted by Ron Miel

I don't think so, the spell description says it works on "a single block of stone." Durkon is stepping out of the junction of three blocks.

Someone on another forum suggests he's shrugging off a camouflage spell.

It's Meld Into Stone. I don't feel bound to that level of rules accuracy, and it was otherwise really hard to show the flat stone warping without having the mortar lines bending too.