Yes! It's simple. Tell him to quit being a cock block. Thats probably not the advice you are looking for. I have had the same thing happen to me. I especially love flirting around with the hired guns. Well I have become pretty popular with the hired guns at this particular place and it drives this cock blocking tool ass security guard nuts! Probably because he is used to being the center of attention. As soon as I start flirting he always has to try and ruin my game. But does he succeed???? OF COURSE NOT! I sit back let him do his thing and act totally indifferent about it. I simply let her see that I am not needy! I get an attitude of "hey I don't give a shit if you want to go flirt with him instead". Well within a couple minutes they are always back over and flirting with me. You know there is no special game you have to run. In this situation it is all about your attitude.
Let me just add this also because I believe in KINO so much!!! If you KINO her the right way the first time you meet her. She won't be able to think of anybody but you. Unless the cock block learns KINO then you might have problems. This is the problem with the whole PUA community eventually so many people will learn this stuff that we will all be cock blocking each other.