Um..maybe you didnt read closely.
It is a huge waste of time to run a scan (lets say it takes 10min)
and then have to reboot and run a full scan again (another 10min).
If spybot would just assume at the beginning that some files are in use (even if they arent) and just reboot the first time you run it,
you would only have to scan once and it would save 10min of time.