You should factor in your scorch melee and flame shield health bonus if you really want to do a good comparison.
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Smoke may be a melee but its not a punch, its a grenade, its thrown as one and can be thrown practically simultaneously as the void nade'. Flame shield is broken by 1 scout, handcannon pulse rilfe, sniper, any melee or any grenade. Its only 50 hp and last for like 10 seconds. You didnt get my point at all did you?