Regardless of opinion, if either of you believe the other party was in violation of some rule, it should be dealt with through a ticket
for behavior. Put the links to the screenshots into the Proof section of the ticket and explain how the situation looked from your point of view. Keep in mind that the screenshots should make it obvious to any uninformed person what is going on - the issue should be so clear, it shouldn't need much explaining, if at all. The GMs will review the issue, check gamelogs if need be and see what is what and rule accordingly.