Just to clarify this for me and any others- I take it that the bottles are co-located away from the engines, and the Halon is piped to the engines; thus there is the possibility of the control wiring from the cockpit being in error thus discharging the wrong bottle, and also the piping from the bottles could be in error sending the Halon to the wrong engine- in fact they both could be crossed and all would be hunky-dory fire-wise except the wrong engine would auto shut down!
Where is the Halon actually directed to? Into the fan cowl or to multiple areas?