The description in Incendiary Ammo says the following:
Duration: lasts until overridden by another ammo power
Fire Damage: 20% of weapon damage over 3.0 seconds
Both Jacob and I have Incendiary Ammo. If we both have it active, what happens when we both shoot the same enemy? Let's say I shoot first. Will the duration of the first application be canceled when Jacob fires, will the total burning time be added together, or what?