So, let's assume Yezhov was still the People's Commissar at the time he was summoned. Then it means he didn't like the use of his speech without attribution. This means that Ozhegov came, said something impressive, Yezhov was inspired, and they let him go.
Another option is that Yezhov was no longer the People's Commissar, and the new one summoned him to express gratitude.
What could be said that would be so impactful? Something like, "I'm here on a reconnaissance mission."
Or, he was removed for security reasons.
Or, the definition doesn't accurately reflect Yezhov himself.
In general, I have a feeling that the surname Yezhov is significant here. If it weren't necessary for the answer, we could easily do without it.
In short, I don't know, it's not immediately obvious, I need to think about it.