Also useful for opening gates

ideally a stallion should have a white ribbon in its tail to warn you..
The OP situation sounds like an irresponsible individual unable to control their horse and TBH that could have happened just as easily out hacking or at a show- you get idiot numpties in all walks of life, i am just sorry that the OP met one on the hunting field. I hope it doesnt put them off going again in the future.As OP didnt mention if any Masters/Secretary witnessed the event- It would be worth the OP phoning the secretary and making sure they are aware of this dangerous horse in case they try to bring it again.