You need to collect evidence. The best proof is a video which clearly shows the violation. Quality of the video must allow moderators to easily understand nicknames and ranks of all the players. Before the creation of the post read *** GAME VIOLATORS SECTION RULES ***

This update is horribe REMOVE IT!! :angry:

When you need to prove a sabotage, you must show that the violation is systematic and repetitive. So your sceenshot is not enough proof.