In my exp the kill radius for combustion is about 3 feet which i stated in my post. The kill radius for a hammer is at least 3 or 4 times that. Lets do the math 3x3=9 so 9 feet or 3x4= 12 so 12 feet but probably more likely to be the same radius as a rocket blast. Combustion is trash especially compared to hammer blast radius. You may return to your basement troll.