So the bull you can see is definitely trying to get his cows moving away from what he might consider a threat but the bull in the distance does not sound aggressive to me at all. It is always hard to tell but the second bull sounds on the smaller side. I think the bull you can see just doesn't want anything to do with having another bull getting friendly with his gals even if the other bull is not yet a threat.
Nicely put sir. Here's an angle for consideration. The bull in the distance is advertising himself and his elkhood which is really pissing off the bull with his few cows in the white tree flat. This youngster is pretty darn proud of his small group of cows and has made the immediate decision to take his toys and leave vs competing with the uphill intruder. This small herd bull is doing everything in his power to pick em up and move em out

. Perhaps his bugles are not completely directed back at the intruder higher up on the hillside to the left, but, as much towards his cows? He's screaming at them in an urgent manner to get them on their way. So, is the herd bull screaming at his cows, responding to the intruder with a challenge/warning bugle(s), or both? Just a thought. Good stuff guys. Thanks for chiming in.