Newbie hay conditioner question for horse hay

Hi, I am about to purchase a small farm (43acres) for my wife and daughters horses.
Last year I did hay with some friends on another piece of land and my wife raised a concern about bushes with thorns.
The hay we did was cut with a mower, not conditioner so the thorny stuff stayed intact, and the horses are bright enough to avoid it.
What happens when something like this goes through a conditioner, are the thorns broken into small pieces that the horses can't about and possibly cause distress/colic?
My apologies if this was asked elsewhere.

Newbie hay conditioner question for horse hay