content: In this case, I do believe it is for a show and they are probably under contract not to intervene unless they absolutely must. For an ordinary citizen, you're allowed to intervene but you should always ask the cop if they need assistance and make it clear that you are helping them! And if you are offering assistance, make sure you can do so without hindering the officer. If you are just getting in the way, it may be better to not intervene or call for more officers.