Hypothetical Admin Transcripts - be the judge!

[Mike Novack]

... B is clearly a troll

I agree. Worse that that, he was an incoherent troll. ( Every artist should at least learn the fundamentals of his craft. )

How can you actually know whether B is a troll or not if exactly the vital part of information is missing: The talk between A,D and E that B referred to?

I'm certainly not sure. I'm not even sure B is a native English speaker (the mistakes don't resemble ordinary "incoherence").