Tasering To Death?

The recent quintuple tasering of a UCLA student who refused to show his ID card raises some concerns.

The student peacefully declined to participate in his arrest. The police solution was to taser him into compliance. Suppose he had chosen to continue sitting on the floor?

Would the police have upped the voltage? They had their tasers set on "stun", or so they say. What do they do when the stun setting fails?

Do they make a martyr?