Leo: The problem with that is- we have the ultimate trap technique. The elemental cage. We have set-up a small boundary across the entire known universe. and if we were to fight a big enough threat, we can use it at will. No matter how fast you are, there's no escaping that, not even teleportation of light speed is helping you.
Andy: And by then you guys could kill him, cause we can nullify all the dudes powers including his defenses, so he'll be nothing but a defenseless creature. If he escapes, the hand of a Satanic demon so powerful that his mere presence would destroy the omniverse would grab him and send him down to this other plane of reality, which would kill him immediately.