Guys, accidental burp in mid-conversation?

Today at work I was sitting with a work mate (a guy) side by side looking at the same computer screen. I was mid-sentence when a small but audible burp came out, I just said "pardon me" and kept talking. He didn't react at all but I could help but wonder what he was thinking. Guys, what would you think?
Guys, accidental burp in mid-conversation?
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