That just means you designed your castle unsafely.

"Alright, but you better be outside of a properly locked up and OSHA-compliant castle with the princess by the time I get back, or I'm not compiling"

And then you do that, but you miss a smoldering ember from one of the castles torches, and everything including the horse and princess catches fire. Next time, pick an escape plan that only requires unsafe for the drawbridge.

There's a totally safe way to do it too, I guess, but it involves building a series of replacement castles, and it's also totally ugly and sinfully slow.