Each person experiences lag based on their location. While one person may have almost no problem connecting, another person may be playing on a bad connection, or a very slow connection.
In my opinion, even if the other person is mean, the best thing to do is to just give it back. I mean, wouldn't you want to expect the same from someone else if you accidentally dropped your stuff? It's better than paying a recovery fee, by far.
As for the harassment, it would depend case by case on what's the best thing to do. Just make sure that the guidelines for reporting harassment are met before submitting a ticket or posting about it.
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Haine, you card. :<