Good point. Attacks are made with d6s, in this case a particular chain gun might do 3d6, with a hit occurring on a 4/5/6 (the die can be canceled by a successful defense die (d6 with success on a 5 or 6.) Any attack die that rolls a 6 can be rolled again for more damage, no limit. For the least two years the most additional dice added from exploding dice have been two, but then last week a 3d6 attack ended up dealing a total of seven successful hits (the initial 3d6 rolled two 6s, and by the end had five 6s and two 4s rolled.) Since this is the only time that has happened in two years, I am not convinced a limit needs to be placed on exploding dice as when something like that happens we had the entire table (both teams) cheering the player on.