I'm a little torn on the 1 lung issue. I too believe they can occasionaly survive when hit in only one lung.The biggest issue with a 1 lung hit that is high - no blood to follow, or very little at best. That is why what Bob (and John Trout) said can be a good thing - keeping em moving keeps the blood flowing. I totally agree, 1 lung deer do CRAZY stuff, and usually don'trun 100-200yds and bed up like a liver or gut shot deer will do. Often times they are just getting it, and it usually always makes for a tough track regardless. After hunting with my club for many years, and trailing quite a few 1 lungers, I will submit that I certainly don't have the answer - and that there may probably not be a correct answer, because its tough to know the severity of the hit. I've found em both ways (waiting and trailing asap) and lost em both ways. Most ended up being a grid search that found em. I wish you the best.