Derpy Accidentally a Portal Gun II

Derpy is banished to the Crystal Caverns with Chell. Somepony wants to break her out.

After inadvertently activating a portal gun and bringing Chell to Equestria, Derpy found herself imprisoned in the Crystal Caverns. She knows that Princess Celestia will eventually relent and let her out; Derpy just has to be patient.

Sparkler isn't patient. And Sparkler has some very particular skills.