If you put the blame away from his network, what might be happening away from his network? If Roughbeast knows his own network, he'd know or at least suspect it was away from his network.
What he wants to know is what is happening away from his network.
You'll see from my post
here, that I did some analysis and confirmed where the problem might be occurring (which Roughbeast had sort of identified).
He now needs to take this to VM.
EDIT: In response to the first part of your edit above, I at least asked him what he was doing on his side at the time of the phenomenon.