second thing: now you have a brief window where the ad hoc tlog backup has been taken but before the db has been put into restoring mode where transactions could have happened and won't be captured.
on top of that, in order to configure things going back to the primary after a failover, you have to delete the existing configuration (even though it's going to be relevant again). and wait wait wait for the service to refresh (30 minutes) and you can't manually force it to happen quicker.