Gas, what kind of bell boots are they? There's a bunch of different types. Some of them don't really have a determined "front" and "back". Some of the ones I see the eventers using on XC have a little notch that fits into the heel so they don't rotate at speed. It really depends on what kind, although in general there's no real harm in leaving them on and working in them that I've experienced/seen!

“There's a lot about discovering who you are and how difficult that is, and it never stops.”
- Libba Bray