I think it’s because they have to get closer to see my call. I know I get some staying back in the woods watching but they can’t in the fog. I’ve found tracks in the snow before where bobcats and coyotes have been tucked in where I couldn’t see them but they could see the mojo and call just fine. Fog usually has them coming in fast and I’ve had my decoy grabbed a few times.
Or they bust me on my walk in. Which has definitely been the cause of 3 bad stands in the past 2 weeks where they just signaled the warning howl and took off.