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This raises an important question:

How did Hela break the seal?

One possibility is that her father, Odin, died and his divine power dissipated. Without his divine power, Hela would naturally break free from the seal.

But how likely is that?

Thor thought it was improbable.

Although his father had been falling into slumber more frequently in recent years, that didn't mean he would die anytime soon. According to Odin himself, he could survive for at least a few more years.

That left only two possibilities: either Odin had suffered an unexpected fall, or there was external intervention.

But that seemed even more impossible.

Thor firmly believed that no external force could cause Odin's downfall.

That left only—

Thor suddenly inhaled sharply, his eyes widening in disbelief as he looked at Leon. He swirled the whiskey in his glass, the ice clinking softly.