Probably enough adrenalin from being chased that you went over the fence without touching it. When I was in shape I could put my hands on the top of a post and jump over .
That's pretty much it.
Growing up where I did, we spent a lot of time tramping through cow and horse filled pasture trying to get to good ponds or creeks for fishing (or just hanging out), so we always scoped a field out closely before entering. Regardless of that effort, the bull would always appear from a small depression or group of trees. Usually it was kind of funny, but there has got to be an equation describing the relationship between the nearness of snorting bull and lack of humor.
I have to say that we trespassed like crazy as kids, but would have never thought to damage someone's fence. I'm pretty positive Dad would have wore me out. Never damage a fence, always close the gate. He wasn't too pleased about trespassing, but new the draw of Elkhorn Creek was too strong.
Seriously, there's no reason to cut a farm fence.