There are several methods to stop the engine:
- cut the ignition cables
- cut the cables from the coil to the distributor
- cut the power from the battery
- put you hand against the air intake
- put your hand against the exhaust outlet
- cut the power to the ignition coil
- cut the power to the fuel injectors
Basicly anything that will cut off fuel, ignition or air will do the trick, but don't try to cut the power from the alternator as the engine can tun on the battery.
By "cut" the ignition wires I mean that they should be removed not cutted with anything as the high voltage can be lethal.