Couldn't agree more with Ummjake, Cynbob, Oryx, Marycatherine and su2009.

I don't agree with Bleu, as the aggressor ended up disturbing more than the person in front of him. As the crew witnessed he was offensive to all other passengers around him and therefore the airline does owe an explanation to those passengers of what action they take in these circumstances.
Just because we landed in Qatar, the aggressor was a Qatari on a Qatar Airways plan, its no excuse to let unpunished this kind of behavior.
I am sure that if Bleu was the victim, he would not have appreciated the aggressor’s attitude!

Tallg,
You seem to be always the nice guy.

PS. Still no news from QR, even after
- 1 follow-up email using their "contact us"
- 1 phone call to customer service, which they say that they don't deal with issues related to past flights and i should email "[email protected]";
- 1 email to "[email protected]";

I will keep you updated when I get their official reply.