We've been doing that for couple of years now. I would highly recommend a wide angle lens. It helps give you a bigger field of view. Sometimes, if really lucky you can get the animal and the hunter in the same shot. We used to zoom out right before the hunter would draw, get him drawing the bow and then zoom back in to the animal. It was tricky to get it timed right. With the second angle, the main camera never has to leave the animal. And like you stated before, no reenactment. Just keeping it real time! Lots of times you'll see a split screen with both angles side by side.