no experience w/ a flare as an ignition source, but do have experience will falling into ice water

duck hunting trip via canoe on the Bighorn River, mid December- ambient temps around 5 above, water very close to freezing as there was a lot of ice flow
we made a turn into a slough and caught a unexpected eddy and were flipped as quick as you can snap your fingers- I swam hard to shore and immediately attempted to start a fire. First thing I found out was that my Bic lighter wouldn't spark when wet. Went to my backup, strike anywhere matches- every time I lit one, it would go out as there was water running/dripping down my arms- five minutes into this ordeal my fine motor skills were toast. We climbed back into the canoe and paddled our a$$ses off (about 3 river miles) to a waiting truck- cold, wet, scared, but alive.
I learned a few valuable bits during this outing (besides the wet bic and matches thing)- good clothing (in this case a mix of wool and fleece) can ultimately save the day; a dry set of clothing in a dry bag is not a luxury item- it's a necessity; tinder- bring your own tinder- PJCB's, wetfire- something that will catch even if wet!; a waterproof/windproof lighter is better than a bic lighter; a good firesteel (w/ lots of practice behind it) would be a wonderful item to have had

; lastly it's good to have angels watching over your a$$