[adamb_]

Initial demo for Face ID failed -- Obviously less than ideal when trying to convince your audience that "it just works".

[nixy]

It was because the phone had been rebooted, and iOS requires a passcode after a reboot.

[kyriakos]

Still a PR fail though

[MBCook]

These things happen in live demos.

[kyriakos]

That's true but they don't usually happen to apple's. Apple takes great pride for their flawless presentations.