"What do you think they're doing in Monsters World?"
While we were watching the group of humans whom we found in Monsters World, Randy asks me that question. I guess I never told him about summoners from the past.
"We summoners can make a contract with monsters in this world like how tamer does. But we can't use the same magic in our world. The biggest difference is portal, I guess. Summoners can summon their familiars wherever they are, but tamers can only call their familiars when they're close. If they are summoners, they should be here to make a contract with a monster. And tamers should be looking for a lot of monsters and get the summoner to return them back to our world.