Laura I think @Renita means when a girl can unlock secondary shield only.
Oh,ok.As I said I have difficulties to imagine what emergencies could be done by taking the shield off but not the belt(even more as the belt is less "secure" with it off...But it depends the purpose of the belt).
Ines there are a lot of times in which I am not released of my belt for every shower I take.
Same for me,most of the showers,I still have my belt on.But when it is supervised,it is totally off,I've never had a shower with belt on,without the secondary shield.I guess it is better to wash with it off,sure.