It certainly could!:-(Just out of curiosity, because I have no breeding experience, is it common for mares to be haltered during foaling? She has the halter on in all the soon-after pix I saw today.
Just seems like lots could go wrong with legs- the mare or foal- getting stuck??
I've seen many pictures, over the years, of TB farm scenes, with halters on both at pasture & in stall; I've never understood it.