Running snapshot backup (freeze/thaw) while running an online backup

In case anyone reads this... I believe I have my answer.  If an online backup is already running, the freeze/thaw doesn't affect it however it doesn't look like the freeze actually works...so you end up with a bad snapshot.

If you try and start an online backup while the instance is frozen it tells you there's already a backup running and will not let you start the online backup.