The mere sight of the corrupted marine beast, knowing that back then, when he drifted through the water in an unconscious state after before forced to dive into the water by the robed assaillant- Knowing that this monstrosity had been in the water with him, and could have, at any moment, dragged him into the depth where he would been powerless against drowning… It filled him with fear.
Griar did not seek to strike back, merely controlling the winds carrying him, heading for the shores.
There was no point in challenging the warped orca, that thing was bound to the water anyways, it would just be a waste of time and energy to fight with it, so Griar simply accelerated, paying attention to the surface of the water, tendrils shot out in an attempt to wrap around him but after a few failed attempts, the killer whale must have also come to the conclusion that Griar was worth too much energy for what he was worth as a snack, and gave up, not appearing at all.
