How do people know your doing dragon/baron?
So I'm in a game as Khazix JG and at level 8 I can solo dragon, I sweep the dragon pit and pink ward it just in case and stand behind the dragon in case i need to E out. I get about half way and I notice mid lane and bot lane MIA, next thing I know theres 4 with me in the dragon pit and I gave a free dragon leash.
My question is how did people know?? There weren't any wards, maybe sound? Only sound I know you can hear in the fog of war is statikk shiv.