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Halon works by interrupting the fire triangle. Not allowing the fuel, oxygen and the spark to intermix. With it going off in the engine bay, you are going to need to vent the bay out to allow more air, to displace the halon. Once this is done, if the engine will still not start, you will need to look at the ignition components to make sure that you are still getting spark to the engine. If the nozzle for the system is right above the coil on this engine, it could have been enough force when discharged to penetrate the coil and damage it.
Sry, check the glow plugs to make sure that they are still working.