In Ontario, you must encase guns, bows, crossbows, etc after 1/2 hours after sunset. This is obviously not the case in some/many of the States is it?

My question is this, what if you shoot a deer at last light and hear it crashing and and stopping some 80 - 100 yards away. After allowing the appropriate amount of time to let it expire, you begin to track the deer. You find it down, unable to move but still alive.

What should you do to put this animal down in a humane and ethical manner if you' re not allowed to shoot?