SOMEpony had to try something from The Book of Irresponsibly Dangerous Stage Magic, and Starlight went along with it (probably to prevent too much injury). Trixie was sorry and offered to help her with something (not specified).
As this tends to keep happening Starlight decided to show what its like to be dangled out for a trick.
PS: Snuggles is a total softie, so there's no REAL danger, but nopony has told Trixie (yet).