the reason the unicorn attks u because it have a fear of weapons so if u draw ur weap, u get attked.theres also a good alternative for that.first, put it in a stable(imperiaL city) then shut it in.then draw ur weap then the unicorn gets crazy and cant attk u,but.........a imp soldier will try to subdue it by going in then get stomped to death. u can loot his body for free, no consequences.