Ok folks just wondering what the rules say here. Playing doubles earlier and one of our opponents makes a cough sound on pressure points when we are playing the ball. He did this consistently over the course of two hours mostly on pressure points but always when we were serving. On serve once the ball reached max height pre strike he cud be heard giving a subtle cough and then consistently during the course of the rally he did the same. What is the ruling here. Is there a ruling. Is it a suck it up and get on with it scenario. I asked him what he was doing on the changeover to which he just smiled and the other two players were not getting involved. Thoughts??