These arrowhead imbeded in animal bone pics always amaze me. You gotta re-evaluate the strength, heartiness, and determination for some animals to continue on. As you say, this one mat not have made it. I've seen other pics like this that looked like the animal lived like that. In case you may have missed it I also shot a deer with a broadhead in it's skull. It was my broadhead from the year before. Imbeded deeply in the deers sinus cavity created by an errant shot on a string jumping deer. I shot her the next year due to a defect in her jaw. I named the doe Lumpy and later realized it was the same deer from the year before.
Lumpy's skull
Lumpy inside.
And she lived a year like this and was healthy enough that she was covered in a thin layer of fat. What a will to survive!!!!! CK