Rainer
Contributor
Maybe they only have one spool but multiple uses. Example: running a search pattern and later shooting a bag (note that's not necessarily the best plan, as you may have need to shoot the bag immediately after finding whatever you've been searching for).
More likely it's a GUE-F class, which requires them to be kept separate (for practice and task loading reasons). After the class, you're encouraged to pre-rig it.