Learn to recognize the different blood types so as to know exactly, or atleast resonably where your arrow hit! Its a shame folks shoot black arrows just for this reason...you almost need to see where that arrow hits so you can make decisions like this! What was the color of the blood on the shaft? How far did you go down the blood trail? Did you see the arrow hit him at all, and what kind of angle was he at? you say the temperature is rising......what is the temp? and how long is it before nitefall? Do you know what the weather is for tomorrow or even that nite...with a bad blood trail you dont want to let rain wipe it away! Reason I ask, it relates to where your arrow hit him at knowing how long to let him lie. It dont matter what kind of rack or lack there of he has, if its a less then desireable hit your gonna have to wait or risk pushing him! Not something I like doing...pushing a wounded animal. The emotions and excitement get up so high that its usually better to wait a couple hours then to go right away...you figure 1-3 hours is fine unless you are looking at superhot days, if you hit lungs liver or heart, that deer should be dead within seconds, minutes at the most! Guts it could take hours or longer!