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I intend for Hailing to enter the Sol system soon-ish. He plans on going to Earth, so Mars and the Red Planet Army will be ignored if they stay out of his way, though if Trombone and others want to create a barrier that would stop Arcosian ships, unless they build it very quickly it's probably too little too late.

My intention was for Hailing to arrive on Earth and begin his investigation for what ever it is that the RA is trying to wish for on Earth. Having zero leads, other than it is on Earth (which is still a LOT of square-mileage to cover) and no way of knowing that the Dragonballs are not unique to Talsaiga, I imagine it would take him a while, months, or even years to even learn of their existence.