Kinda off topic, but... Nitrogen vs oxygen. Neither will burn. It is misunderstood that oxygen burns. Oxygen by itself will not burn, it will however provide the catalyst for other items to burn.
Take your oxy/acetylene torch. Turn on the O2 by itself and use the striker to see if you can get a flame. The striker sparks will be very bright and burn, but no flame from the torch tip.
And from a previous post, nitrogen is used to "purge" any flammable gases from a fuel tank. Like the fuel tanks of an F-15. They would purge the tanks with nitrogen for hours before any maintenance was performed. Been there and seen that.