That once happened to me. the forefinger went right round between the chain and sproket. finger stayed on but had a funny thimble of my skin that had become detached from the bone up to the first knuckle.
after all the oil had been cleaned out a bit of glue from the doctor and it was ok.
all good now 3 years later but the nail on that finger grows three times slower than the rest of them.
That once happened to me. the forefinger went right round between the chain and sproket. finger stayed on but had a funny thimble of my skin that had become detached from the bone up to the first knuckle.
after all the oil had been cleaned out a bit of glue from the doctor and it was ok.
all good now 3 years later but the nail on that finger grows three times slower than the rest of them.