I did end up in a semi bad situation about 2 months ago when my BIL's girlfriend went nuts and decided to attack me ON MY PROPERTY. I called the cops but refused to get off my horse until they arrived (which took nearly 30 minutes). Poco (my stallion) was amazing in the situation. I shifted my weight to the outside to prevent her from pulling me over (and making the only vulnerable area on me my leg). Everytime she tried approaching me on the side Poco would swing his butt to her and threaten to kick. When she tried going around the other side he made a good attempt to bite her and kept his ears laid back the entire time. By the 2nd attempted kick she decided she had enough and started yelling at me about how my horse was dangerous... DUH! You came after me!
Luckily she left right before the cops came and it all ended well but it was nice to know that in that situation my horse actually took the initiative to defend me as well. It also made me wonder if that was something any horse would do or if it had something to do with him being a stallion "protecting his herd"?