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The guys just got carried away.
To Vladimir Verwolfovich, it would have been better to first inform the opponent about surrendering the game, and then check the save files. And based on the results of the review, confirm or deny the report. Or better yet, just ask the opponent directly, but in a polite manner.
Instead of:
"Hey, you broke the rules.
You added wyverns."
Ask neutrally:
"You had vivs and nomads, where did they come from?"
And when HeadHunter explained, load the save and try to do the same. I'm sure, after such a check, there would be no questions.
And in general, reviewing and replaying save files is very useful.
To HeadHunter, don't escalate the conflict, because you were playing with a new player, and it's quite understandable and forgivable that he was surprised, even if in such a harsh way.
People are prone to arguing. But those who remember that we are not here forever will immediately stop all disputes.