I' m not an expert by any means. I' ve only killed 7 deer. Only once have I heard a deer blow after being hit and that was two weeks on one that I killed. Hit it in the lungs. Blew a half dozen times or so while running off. I guess it could have possibly been another deer that was nearby where the deer I hit ran to but it appeared to be the deer I hit. All of the deer I have killed with a gun have ran off or droped without blowing though.