What odd comments here....
I work with the airbus every day, there is not jettison system and never will be, with the fan cowls gone they have likely damaged the engine ( as they did for the right one given the fuel or hydraulic trail ) you land ASAP, with the cowls gone the fire bottles are useless and there is a very good chance they have damaged something departing the engine.
Spare a thought please as there will be one or more guys in engineering feeling very sick tonight..