well i wud add instakill to fatman becasue "it just works" , surviving some atomic assplosion right near you is unrealistic anyway ... from my understanding of the old good fallout you should be pulverised , the only bad thing about that is a new death animation ? or just using the rocket loncher one which isnt making sense either way ... screen shud turn white by turning the gamma up into the universeand , so it blends you and then your char shud be pulverised oh and ofcourse u cant loot a boody which was hit from some nuclear warhead , items get wiped from inventory aswell which would spice the usage from such gun more up ...