Like Huntingson said, that 1% will happen. You could blame it on the bow, the broadhead, or the shot placement, but sometimes you just can't kill them. I shot one about 8 years ago at about 35 yards from the ground. I shot muzzy fixed blades. I had it on video. It was a complete pass through just over the heart and perfect front to back. The blood trail could be followed walking fast and standing up. I trailed it for a mile before it quit totally. He was chasing a doe and I think the adrenaline helped him run away. We searched for 25 hours straight (3 guys), and we didn't find him. I waited for the buzzards and nothing. I went back in the winter and looked for the skull, once again nothing.

It is easy to blame it on the escape goat (mechanicals), but that may not be the answer. Unfortunately that is where the blame will land. I have been searching for a mechanical, but have never found one I fully trust. I have taken about 12 animals with muzzy 3 fixed blades.