I can't even comprehend the level of suffering involved here
Not only did the horn go deep into dude's ass which itself would be horrifying to experience, but the horn twisted all around 180 degrees while inside, ravaging everything in there. Dude's whole body weight was supported by the horn in his ass. Likely fractures to the femor or pelvic bones as well.
Mess with the bull, you get the horns. This should've been outlawed a long time ago. Plus cruelty to animals.