Protect Volcor until you reach the road, then speak to Terenthis in Auberdine.
All right, [player], force it is. Let's get out of here as soon as you're ready. We'll fight our way down to the road--Grimclaw should still be there. Once there, we can part ways.
Terenthis will want to hear your version of the story immediately, so head to Auberdine after we make it out of here.