Well learn something new everyday. I have personally never in 15 years of hunting whitetail deer only with the bow, have I ever seen a deer shot thru one lung survive, ever. Notice I said thru. Nick the outer edge, maybe, but thru? But if you say you have personally witnessed this, then I believe I guess. As far as travelling 10 miles, a severely injured deer doesn't generally roam too far. Were they pushed? Why if they were questionable shots?