"Hm," Vastra tilts her head at the frog, squinting back. Vastra, in contrast, does not remember Fantasma.

"Under certain circumstances, passing through the time vortex can reassign or strip certain characteristics if it's done clumsily. Or, perhaps, in a hurry?" Vastra offers pointedly. The rescue mission had moved out quite quickly. "In that case, usually the only way to restore things to normal is to return to one's original timeline."