Her aura changes every time you click the fire button with your mouse or gamepad, the player can change the modes at will anytime, when the aura is orange, it burns her life and deal a massive fire damage to all enemies inside base on how much life she lost, when the aura is green, she moves faster and health regeneration is doubled. Using the orange aura all the time in the beginning will mostly make lose, but if the player invest on health regeneration and area increase(bullet size) they can overcome the self inflicted damage and have the aura activated all the time, making it on the most powerfu/brokenl abilities right now in the game.