the cavity has to fill up before it will pour out.
internal bleeding..has to make it to the over pour, which is the hole yer leaving with yer bh.
it is common fer em to run a bit...
take a deep breath and take off running...you can make some distance. but if we taped yer mouth and nose, you'd pass out rather quickly.
one lung can leave alot of room for a deer to run. so, as mentioned, its a good idea to keep yer eyes and ears open to mark the last spot. and dont go trampling through everything looking for blood. find a drop, no one passes until ya find the next drop. good practice is to track back after ya find the animal.