#4 The first leg is followed by the second foot and nose at the same time. The black arrows indicate the feet and the white arrow shows the nose, still within the sac. Next

 

#5 At this point, sometimes the mare will get back on her feet and move around. Both feet and the head are through the opening. Next

 

#6 The head appears. In this case, the sac has broken and the nostrils are clear. Next