"If you use the Emergency SOS shortcut, you need to enter your passcode to re-enable Touch ID, even if you don't complete a call to emergency services. "
But I temporarily enabled it now to test. Maybe I am pressing the power button wrong but rapidly pressing it five times does not prevent it from allowing FaceID to unlock the phone. Whereas power plus volume up button does indeed.
Btw, when I normally have FaceID disabled from unlocking the phone, does it wipe in-memory encryption keys when locked with a single touch to the power button or not? I was assuming that it did, but I realized now that this assumption might not be correct.