The spirit (Hand) that sealed Ganondorf thousands of years ago is thus freed.
The hand chose to save them and break the seal, knowing that it’s power would soon run out otherwise.
A mini earthquake disrupted the cavern and caused Zelda and Link to fall. The power that has bound Ganondorf over the ages had been slowly waning, and he took advantage of their visit to his chamber to escape. Malice corrupts Link's hand when he accidentally releases Ganondorf by entering his sealing chamber. Click to expand.This is how I think it will go down.
