[cosmorocket]

Nice about holding both volume buttons and power one! However, you need to foresee the situation where you can get in trouble, right? If you just walk along the street in a big city, you probably should do this just before you leave your home?

[evan_]

I think the idea would be you do that casually in your pocket before handing your phone over to a police officer or TSA or whatever.

if you're expecting to be mugged (!) or you're traveling through a hostile political environment you should probably just disable Face ID altogether.