Renee, I believe we had a bit of a shoulder lock. When one leg falls a little too far behind the other, the shoulder gets caught up on the pelvic bone and everything stops moving. I could tell that's what was going on because the more she pushed the further behind that little leg kept getting. To fix, is easy, just move the one forward leg back a smidge and then there is more room for the second leg to slide back into proper position. If I see something I suspect is not right I get in there and fix it right away. I'd rather do that than leave it and have the foal wedged in so tight he cannot be readjusted. Also you might have noticed at the first when she was pushing and nothing was coming and there was no amniotic sack showing inside, there was a bump near her anus. I pushed that bump(foot) in and down and it immediately slid down to the proper exit. If she continued to push and the foot kept trying to exit the anus, eventually you can get a rectal tear and that is bad news for the mare. I'm a hands on foaler, some dont' like it, but Ive never had issues with getting my mares rebred, so I guess I"m not hurting them and maybe I'm helping. I like to think so anyways.
LOL long blurb. I'm a bit passionate about foaling. LOVE IT!