The characters are having the following conversation (provided for context), and I'm unsure as to what こと in the last line means. According to a previously asked question, it has a large number of uses. From the context, I'm tentatively guessing that こと means "thing", seeing as how the topic is about a talent that the first character was previously unaware of. I'm unsure though, as こと has many other uses.
Is my understanding of the use of こと in the above sentence correct?