I didn't know the iphone was designed so ass backwards.
Usually it's the security system that polls the sensor and compares the data to what it has recorded. But you're telling me a dumb sensor is actually delegated the task of pulling fingerprint data from encrypted storage, comparing it to its sensor data, and telling the security system to unlock?
You would have made a horrible speakeasy guard during prohibition. Asking the would be patrons if Swordfish is the password they know and opening the door if they say yes.