At first, he does not 'respond' when the echo of her voice name reaches his soul, because so much of him has been stripped away by the storm that he simply does not know, does not even realize that it is he which she is calling out for.

But a second call, a second echo...and something grabs hold of him.

Skellig.

(A splintered, battered shard of rock holding tightly to the earth beneath a raging ocean, steadfast against driving wind and crashing waves. Desolate and alone amid the storm. But she reaches him, and he knows he is safe.)

He snaps his eyes open and focuses his attention - his full, present attention - to her gaze. He is with her. All of him is with her.

My dragon.