My mistake, I checked the location names again. Bend of Time is also called 次元の狭間, same as Temporal Vortex, hmm
But since he metioned "fruit", so I assume it should be Temporal Vortex.
The game doesn't hint enough how he was able to be in Temporal Vortex.
He was on sort of training, perhaps he read an old magical book...but who knows.
And it seems someone can enter Temporal Vortex, for example, Harle.
Sprigg couldn't leave TV by herself, but Sneff did that(perhaps he figured out the trick in the tower). So perhaps Sneff didn't met Sprigg(according to the JPN script), or else Spigg would have followed him.