Not expecting a continuation of their battle, after Frigga had been mentioned, Thor was caught completely unaware by the blast. It threw him backwards into the boulders and he smacked his head hard enough to crack one. Dust from the stones flew everywhere as Thor collapsed to his knees, dizzied and seeing spots in his vision. He swayed where he knelt, clearly disoriented.

He ground his teeth in frustration at the pain and dizziness, grasping at Mjolnir uselessly, as the other hand steadied him on the ground. He couldn't quite see straight enough yet, to use the weapon properly.