The instant Ancient One died, spacetime reversed on the spot, giving Galactus no chance at all to continue going after the Infinity Stones, and Ancient One came back to life once more.
"Lord Galactus, if you do not use your true power, you cannot break through this spacetime. But from the look of you, you likely do not wish to waste your strength. Why don't we negotiate here? If you want to devour a planet, you can absolutely choose another target..." Ancient One, alive again, looked at Galactus and tried to persuade him, her voice helpless.
To be honest, if her strength had been enough, Ancient One naturally would have wanted to force Galactus back, even defeat and kill him. But the gap in strength between the two sides was too vast, so vast that despair had already filled Ancient One's heart, despair so deep she could not see any chance of victory at all, let alone avenge Robet.
After all, this was within the Bizarre Spacetime outside Earth, not the Earth dimension, where she faced those Dimensional Demon Gods and could rely on the special nature of the Earth dimension to suppress them. Right now, with only these three Infinity Stones, Ancient One was far from Galactus's match.
"Not bad. You see things clearly. I indeed do not wish to waste my strength. But your magic is not without flaws. In the end, you are only a mortal. I wonder whether your consciousness can keep enduring every reversal of spacetime?" Galactus's calm voice rang out, and everything around them began to be destroyed, until it recovered once more.
Only this time, Ancient One's expression did not look good, because she knew she had no way to keep stopping Galactus forever, not even a Galactus who was not using his