Doesnt really look like they were leeching at the server, more like they had to leave for urgent reason.
If someone is clearly not playing and character only hangs there, you may report them as leeching by QML. If he is not there, you will be rewarded an extra multiplier.
But if somebody is on the server just standing and responding only for the report message, you should join in
IRC and ask for an admin to join in-game and check him.
I'm locking this thread, because this is not a place to discuss. As you can see from the warning levels of people.