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While Shin and the others were doing their quest, the people that Shiella had sent to build the teleportation portal were busying themselves with constructing the altar needed to make the portal functional.
Among the three chiefs sent to this place, Black Hammer, was the one who was the busiest because needed to build the altar from the scratch.
Compared to him, the others were pretty much doing a leisurely job. Tinker only needed to set up his devices in the perimeter alongside the unique gadgets designed to defend the surrounding area.
Adept Hands and Balle only needed to inspect the formation drawn on the ground to make sure that there was nothing wrong with it. But given Shin's personality, he already did a good job at modifying the whole formation and even changed the coordinates where it was connected, so those two didn't actually have anything to do.