Can't comment on this particular helicopter as I don't know the type.
Most aircraft though will have at least two methods to shut down the engines, the normal engine master switches and some bloody great red fire handles. Usually those fire handles are either mechanically connected to fuel valves, or wired in such a manner that a break in electrical continuity closes the valves.
This doesn't always work though, see the Qantas A380 incident at Changi for example...
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wheresthefish Partly filled with wrong, Mon 9 Jul 2012, 16:56,
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