The building where Shalia's friend was hidden was a shopping mall. Hiding there had been a good idea since one would be able to find many supplies. Still, when the zombies appeared, it was probably where many people met their ends, so a few zombies and corpses probably were there when they went in there. Regardless, despite the fact that they were so close to each other, it still was possible for them to feel each other's presence.
"I suppose we can't just call his name inside… the noise will attract monsters and fighting them in a confined place will be a pain," Luke said.
"I should be able to feel his presence once we are within fifty meters away from each other," Shalia said.