If an artery was hit there probably would not be a puddle of blood but rather blood sprays. It does sound like a pass thru shot if the deer was standing in front of the tree. Did you check the tree to see if your broadhead was inbedded into it? Not sure why everyone if in a hurry for you to go get it when in doubt of the shot though. Certainly if it was a good hit he aint' going no where. And if a bad hit an overnight wait is only option followed by grid type search. ..........dabow