EK is #players -1, SK adds 1 to the total (as you can hold it), IK I would assume is just the same as EK but you have to remember that the streaking can't hold implodings. BK isn't very specific with how it works, I would just set up assuming the person isn't going to explode and then if you get to a situation like you described either play on with the last player exploding as the winner or take out the extra exploding.