*the world tilts crazily as the colossus swings its leg, but your grip and the shadow's grip both hold. It's slower than you are, but that's no bad thing as the monster lurches forward, and you reach the ledge without incident.
It's just barely possible to reach out a hand and grab the edge of the stone skirt-shelf, swinging yourself up with your noodley physique. The shadow can't quite manage it on its own, but with your assistance and a lot more scrambling, you both make it up onto the ledge.
This location doesn't seem to be affected much by the colossus's motion; a gentle sort of rocking motion is all you can feel. The back you're leaning against is matted with thick fur, all the way up to the shoulder. You can rest here a moment, if you wish.*