I was a the pugger with a 4 man guild group in a +5 Arcway. Ran out of time on 2nd to last boss. Their monk (a Pandaren ironically) decided at that point, his time was better spent to having dinner so he left. We 4 manned and finished the run. The lesson? Sometimes even your guildies are shit and will fuck you over. I certainly hope they pruned him from their roster.