We had a bull come flying into a wallow one time. Totally unprepared, not calling or anything. Just heard thundering hooves coming down the trail. Dove under a young conifer and he came flying in and proceeded to tear the crap out of the ground 15 or so yards away. My partner was 6 or 7 yds from the bull, on the wrong side of a tree. The tree he was behind was between the bull and I. I gave the lightest squeak on a cow call thinking he may turn and come towards me giving my partner a shot. The bull spun, pinned me, gave that “ oh shit” look and bolted.
If I had a do over I would have had patience and waited him out. If he came my way, partner had a shot, if he went the other way then maybe we could have turned him and brought him back with a call.
I agree with BMI above, when you. Are a call at close range they immediately know EXACTLY where you are.