If you only got one lung, which I would tend to think that you did, that deer could go quite a ways on the sprint before having to stop. I would think, judging from what you and not everyone else has said, that you have a dead deer. If you got a foot of penetration, you got some goodies in there. You will not find much blood with a high entry, but there is plenty in the cavity of the deer.

That deer could have easily traveled 4-500 yards on a single lung hit. He will, however die with a single lung hit in almost all circumstances if you had a sharp broadhead that cut as it should on its way in. Best of luck...I bet you find him. Just look a little farther than you would expect to have to go...they are amazing critters that desire to live as long as possible.