I don’t have the background story to go with these pictures but judging by the sleeping bags and overall looks of the man, he’s probably homeless and has lived on that piece of cold ground for a while. His clothes and the environment make it look like it’s somewhere where it’s cold in winter. My guess would be his feet started to die off after exposure to cold weather (frostbite?) and someone cut them off for him as a precaution so it doesn’t spread on because the flesh turned necrotic. I could be wrong, though.

Those stumps look freshly cut, but the foot looks pretty dried up. That could also confirm the notion that his feet were amputated by an amateur with a knife who was just helping his pal who could not afford proper medical care. Anybody knows more about it?