So we all generally know how DPS bombs work. You get an AoE explosion, and, roughly speaking, anything within that AoE gets the same amount of damage done to it. More monsters in the blast radius? More DPS!
But, much as a quantum mechanical wave collapses to a single particle when observed; what if the collective damage of the bomb blast, rather than being spread evenly among the monsters, instead collapses to a single particle of destruction centred on just one single monster?
For example, let's suppose we have 4 zombies shuffling around. We drop a nitronome in the middle of them, and the detonation does ~200 damage to each (and knocks them into your team mates mid-attack, most likely). Drop the Copenhagen Interpretation Bomb, and the detonation does ~800 damage to one, zero to the other three.
Now, it's quite likely that once you get more than 5 or 6 monsters grouped together, that the amount of damage delivered would be more than enough to instantly vaporize any single one of them a few times over, so the excess damage would then spill over to another random monster and so on down the line until it's exhausted.
Granted this does have the possibility of being a bit OP, so let's say that the excess damage spill over scrubs off 1/4 of the remainder with each monster it goes through.
So its kind of like a chain lightning attack?