Wow neat video! I have been threatened on a trail before but not to be attacked, we were crossing some land and (it was not this guys land and we DID have permission to be there) it was me, my sister, her friend, and I. We were riding through and then when we came back through he had parked his huge tractor on the trail so we couldn't get back out, we had to cross through some huge thorns and briars, and he came up to us cursing, in front of the 2 kids (10 yr old, and 8 yr old) threatening us and telling us he would shoot at us and stuff if he caught us back there again, and that he would call the cops (even though it wasn't his land) ahhh the people these days...
But if someone tried to attack me like in the ^^ above video... I would be freaked and I have no idea what my horse would do lol just cluck and squeeze and hope my training was enough to send her off and away in a lope!