Communication is so important when you are out in the woods trying to get and animal down. The communication between producer and hunter is so important. Everyone is a little different but my kill or no kill command is NO or KILL EM'.
The reason I use NO and KILL EM' is because it can never be confused with GO or Yes or some other command I do not want to happen. I make it clear to whoever I am filming those are the only 2 commands you will hear from me.
KISS, Keep it simple stupid. Make sure you talk to your hunter or producer before that big deer comes in and get your commands down that way there is no confusion before the moment of truth.