Kog'Maw Passive Rework Idea

Instead of sauntering about for a couple seconds, hopelessly trying to catch the assassin who killed him. How about, when Kog dies, he instantly explodes, coating all champions within the radius with his digestive bile, doing no damage, but massively eroding their armor and magic resistance. This (IMO) would be a much more potent deterrent, especially in teamfights, against bum rushing kog'maw as the people who are in range of the explosion will now be very vulnerable to the burst of Kog's team. Not to mention that it fits better with his theme of an immobile anti-resistance hyper carry.