No bleed to run the starter obviously.
So Engine master switch off. ( unless the Engine can stabilize at idle )
By this point there should be more than enough N2 ( or N3 for RR ) rotor RPM to clear the Engine sufficiently after you cut off the fuel.
Tell the engineer to put the air back in anyway.
Then when below 30% N2 ( or N3 for RR ) crank the engine if it's required to clear it. ( basically as per the tail pipe fire checklist ) but I don't think you'd need to, just monitor the EGT decrease....
4/ if all else fails run...
Well that's what I'd do anyway.....
It's something you should think about anyway as it could happen to you starting using the APU anytime....