Once upon a time I had the stock off my M1 and the bolt open. I was holding it in my left hand balancing it, sitting in a chair. I leaned down to the right and reached for a brush, the Garand tilted toward the barrel end and the follower touched my thumb, the bolt slammed forward and I had the whole thing hanging off the end of my thumb.

So
I'm gonna vote fact. In the process of handling one with the bolt back, its possible to close the bolt on a finger, or thumb in several different ways. So care and caution should be used. Its probably not gonna cut your thumb off, but it hurts.