I think if fireborn got changed at all it should work like this... When your super is charged you lose your melee and grenades, BUT you cause a burn AoE around your guardian, igniting any nearby enemies. Upon activating radiance from death, you regain your grenades and melee abilities and they will have no cooldown while radiance is active. Activating radiance while alive operates as normal. This makes you sacrifice your abilities to hold onto the charged super and use it as a lifeline, while encouraging Warlocks to stay engage in the fight.