Dragon Valley
Not long after Link plunged into the Sea of Void, Gretel watched as the black tentacles in the city began moving even more erratically.
At first, the tentacles had been whipping against the binding rune circle in an orderly fashion, like a black tidal wave. Now, it seemed that they were beginning to retreat from the circle in a state of complete disorder.
It was like watching a pack of dogs running away in defeat with their tails tucked between their legs.
This lasted for more than a minute, and then, all of a sudden, the tentacles slackened and fell to the ground limply, as if they had lost all the life in them.
This went on for another ten seconds, and by that time, Gretel was sure that the Void Tyrant was dead.
Outside the city
Lucia Silverstar noticed this as well. Upon seeing the state of the tentacles, she immediately shouted ecstatically, "The Void Tyrant is dead! It's finally been killed!"