The thing about horses is that they have a gene which encourages them to injure themselves!
I have seen some horrendous injuries when they have broken through a fence.
Had a livery mare roll and get caught in plain wire with her back legs, that was a real mess.
A TB yearling colt impaled himself on heavy wooden railings - that entered his chest and exited by his elbow.
We had an alley between the fields. One morning when I went to feed I saw galloping hoofprints in the alley. The gate to the paddock was opened but bent at right angles. On the latch was lung,
The two brood mares, not long over from Ireland, had galloped into the gate which had burst open, galloped down the track to the road gate, stopped turned around and galloped back. With the gate blocking half the gateway one horse had pushed the other onto the latch and it had punctured her ribs and lung near her elbow.
Yearling colt tore his side open on a gate latch.
Had a youngster entangled in electro tape when it snapped in the wind.
When we think of safety we are doing it all wrong. Fences should be barn wire, preferably loose and rusted, dump all trash, especially anything metal in their paddocks and they will be fine.