VIDEOS:
Amethyst as Jasper
The only thing that alerts the Rubies that Amethyst is impersonating their leader Jasper is when she loses control of her shape-shifted form.
Example of:
A Rotten Time to Revert
Lost - Wookiee Prisoner Gag
Example of:
Trojan Prisoner
Crashing this Plane
Example of:
Trojan Prisoner
Infiltrating the Fortress
Example of:
Dressing as the Enemy