Hey all, thanks for the comments. I DO NOT allow Bella to "play" with me in that way, and she has never tried it. She is a horse who does not generally rear or buck, if she did she would be chased off or hit if I have something handy.
Since I was not there, I couldn't do anything about it. But Chris said he yelled at her and she went away. I do agree that the behavior is unacceptable under any circumstances. Chris doesn't have experience with horses and he just didn't think about it, he just went in because I told him there were new gopher holes. This was a learning experience for me. I should have told him long ago that I would prefer he not go in her pasture/paddock/stall without me present. My grandkids and my sister all have those instructions. It's a little difficult to set rules with the hubby, but what I told him was that I don't want him dead and it'a best for him to let me lock her in her paddock if there is a next time. He was fine with that. He takes care of everything on the farm and has a hand in all the animals, but then I got a horse. He has no experience with horses. I guess neither of us realized, there really is no area of off-limits for him on the farm. Now there is. He's okay with that. It breaks my heart to think of what could have happened.
I am grateful to my higher power that my husband did not get kicked that day. I have warned him before about ear pinning and getting too close to the fence where she could "demand food with her teeth." BTW, that habit is broken now. She does not get treats from the hand, so she no longer "asks" for treats when you are near the fence. I just keep stressing to my husband that you cannot ever be too careful around 1,100 pounds of horse.
Thanks again, and thinks for letting me write all this out, I needed to say it.