Very bizarre situation similar to others here, Texas Heart Shot on a buck years ago... wired animal, small twig deflection, and he spun to go back the way he came when he heard the 'tick' of the shaft deflecting.
Heavy arrows + sharp heads... entered and with each bound, went side to side taking out both kidneys. He was down and dead in 50 yards!
There was not a mark on the hide anywhere, and the shaft was buried to the fletch.
Saw it and hit my knees 20' up in a stand and prayed for that deer's demise to be quick. It was!