I wonder if they put him on a Cardiopulmonary bypass (heart/lung machine) and got a forced rhythm, if that would fool the touch sensor?
Maybe Mythbusters could try that sometime.
That might actually work, but it's way too late now. The TouchID won't work after a set period of time and requires the user to input the passcode to re-activate the TouchID. It can be a short a time as five hours, depending on how frequently the user actually touches the sensor normally.