Believe me, I'm not one of those people that believe the Yankees can't beat the Angels. Also, I don't think they're as good as they seem right now. Regardless, I just don't see them taking a series out there, and when I mapped out the Yankees' remaining games, I had them losing that series (1-2) and losing the home game.
However, I tend to be a bit pessimistic, and I was trying to be conservative.