You need to have a good draw/send.. and that horse needs to know how to respect space and not going to run you over. If you have those and know how to manuver the rope/whip and yourself WITHOUT falling over [did this once LOL!! Luckly Chance knows to not run me over. I laughed for 10 mins straight :P] its 100% safe as long as you have what was stated above. :) But with everything horse related anything could go wrong and you need to be ready. Set it up right and you should be okay.
I had just a plain old rope halter on her. Wont use anything else I've fallen in love with those things. I can't stand nylon halters anymore to work horses in now. Lol.