Thanks for the downvote, but you made an argument from authority and didn't back it up. Not only that, but there are others "authorities" with the opposite opinion.

Hacker News doesn't allow downvoting direct replies to one's comments. He could not have downvoted you (unless he has several user accounts).

Thanks, good point. I'm trying to fathom someone downvoting someone asking for an explanation without a sock puppet being involved.

I'm disappointed though--if he or she really is an expert, I wanted to know why they thought that.