[smaccona]

By default, clicking the power/side button 5 (not 10) times starts a countdown to dial emergency services. If you don’t cancel the countdown, it calls emergency services for you. Either way, biometric unlock is disabled until you re-enter your passcode/PIN. This can be disabled in settings.

Holding the power/side button and either volume button for a couple of seconds (just pressing them together and letting go creates a screenshot) presents a menu allowing you to power the phone off, display your medical ID, or call emergency services. You can also configure settings to have this action do the countdown as described above instead. Either way, biometric unlock is disabled until you re-enter your passcode/PIN.

Either option is pretty easy to do unnoticed with your phone in your pocket.