In chapter 183 from the novel we learn that telekinesis is a skill that only the big boy hunters who defeated Kamish the dragon have.
There's also chapter 197 with this passage
"Goh Gun-Hui wordlessly stared at the water bottle before extending his hand out. That prompted the bottle to fly into his hand."
that kinda throws a wrench into that theory, but not really since the old man is the only one other than the 5 hunters and the MC that possesses that skill / magic type. Thus we can infer that it's a rare skill that only certain special people have.