You don't find it strange at all that a post with only 2 points in the past 28 minutes shot up to the front page on a weekday afternoon? My only answer is that

You don't find it strange at all that a post with only 2 points in the past 28 minutes shot up to the front page on a weekday afternoon? My only answer is that what's displayed doesn't necessarily match what's used for the ranking--that there may be some sort of lag. But yes, it could be possible too that somehow one can bump up their posts through other means. The original commenter even mentioned this as an aside. If another reader didn't like it, they could've collapsed it.