I think that this is very practical. Assuming the PH will back you up, while it is his job, may not happen do to unforseen circumstances which may prevent them for being able to shoot. I could think of many things from blocked view, missing his shot, or too slow on the trigger. It is nice to know that someone has your back but I'm not going in and counting on my back being covered. Its too easy to run into something where no one has time to recover. I personally know a PH bitten by a hippo last year while looking for different hippo shot by the client. They had to air-evac him to the hospital. Good news was after a couple of surgeries he is back in business againg this season. The bad news was they never found either hippo for the client.