Living in farm country, I can attest that dairy bulls sometimes DO want to stomp a guy into the dirt. Tractors and such may be involved in getting hurt, but a dairy bull will suddenly and intentionally try to mix you with the mud.
We have more occupied graves than anyone would want for just that reason, one being filled with the remains of a 20ish guy who was working with a bull he had raised from a calf, taken to the county fair, etc. It just suddenly decided to kill him one day and then spread him around the inside of the stall for good measure. His parents found what was left of him a couple hours after the fact. That stall is still there but it has never been used since.
For that matter, a Hampshire or Suffolk ram will try to do a number on you, too. We had one that you simply couldn't turn your back on or he would come at you. I always carried a shovel handle when I was around him and smacked him in the head, across the shins, etc. to discourage him. The only time he learned anything was once when I sidestepped him and tagged him in the, umm, "udder" as he went by. His hindquarters kind of sagged quite a bit and after that he kept his distance. I still didn't trust him, though.