The plan was simple, Leon would lure Netro to another planet, and his lackeys would attack Earth… at least they would try. The humans would fight back as much as they could, and once Netro is far away, Ilyana would cast a spell similar to the one where the angels used on Celosie and thus cut the connection between Earth and the rest of the universe. After that, Ilyana would help the humans deal with Netro's allies.
Leon couldn't remember all that much the conversation he had with Netro, but he seemed a prideful guy. So, the chances of that happening were relatively high. The problem was to how to defeat him. The only thing Leon knew about him was that he could use summoning magic to summon being like Leon to other worlds. Since they didn't teleport to Earth, they probably didn't have the power of Shadow on their side. So, if something goes wrong, Leon would be able to run away for a few minutes.
"You never know what can happen in life…" Leon said that while he was standing on Mars.
