The man with crutches has a bell around his neck like a leper. In the 15th and 16th Centuries there was a massive leprosy outbreak and lepers were confined in secure units outside the cities. I would guess that he is a leper because of the rags and his lesions which were common with lepers.
In the 18th century, hospitals excluded patients with contagious diseases like leprosy, fever children and stds. These people were eventually housed in institutions specifically designed for them and from which the word 'lock' is derived. Loques is a French word for bandages or rags. The excluded were locked up and restrained and they were called Lock Hospitals.
Prostitutes became the lepers when syphilis replaced leprosy in the 18th century. There was a massive outbreak of syphilis and venereal disease hospitals were set up. The average age for a syphilis infected prostitute was nineteen.
This may be a prostitute and leper neither of which would have been welcomed by a church. A leper would infect the congregation and a prostitute would have been seen as unchristian and unclean.
I got this information from a book called, Prostitution and Victorian Society by Judith R Walkowitz.
Looking again at the image, it looks like the snow is falling so heavily that the foot prints of the woman are being covered up and it isn't a stone