Alkeides was one of the few participants in the battle on Main Street the day before who had not vanished and remained in Snowfield.
The previous night, when the “black smoke” that overflowed from the hospital had been about to envelope him . . . Alkeides had summoned four of the Horses of Diomedes, one of the powers of his Noble Phantasm King’s Order, sent three into the black smoke as decoys, and succeeded in escaping the scene on the back of the fourth.
He had, however, suffered an attack from Rider—the Amazon queen Hippolyta—who had chosen that moment to appear, and sustained injuries.
Both those injuries and the hydra dagger wound in his side had now completely vanished.

Fate/Strange Fake: Volume 5, Chapter 16 ("Breaking Dawn & Wakeless Dreams I")