Applejack uses Rainbow Dash to see if she was just turned off by Trenderhoof or stallions in general. When things start going better than expected, something rather unexpected happens.
My name is Eureka and I'm a young unicorn mare from Vanhoover. (The town of Vanhoover, not to be confused with Vanhoover B.C.) My cutie mark is a key and I'm very talented at figuring things out.