Certainly all the ingredients are there for such event to happen.
Lets see ...
Decending = Low Power Setting (lets call it "little flame")
Airspeed - If no turbulence, guessing it at 220 kts or even a tad more. This is not helpfull for the "little flame".
Then the freaking flood of water comes in (Heavy Rain) ... et voilá ... puts out the "little flame", or we have "Flame Out".
The crew selected manual engine ignition for the remainder of the flight
Wise decision !!!