Bryce Harper's hitting mechanics

I'm not sure if anybody has ever noticed this before, but Bryce Harper has two different hitting mechanics. I've read hundreds of scouting reports on Harper and have never seen this mentioned. I find it very interesting. I've been watching baseball since I was a kid (I'm 31 now) and I've never seen another baseball player have two different hitting mechanics depending on the count.

Harper's main hitting mechanic is a normal lift and drop of his front foot. There's nothing different about it. It's identical to thousands of baseball players around the world professional or amateur. His second hitting mechanic is a toe tap. He barely brings his foot up and kind of twists it. This is pretty common now in baseball today. B.J. Upton comes to find when I think of a player that deploys this hitting style.

It seems to me Harper mainly uses it when he is down in the count. He will also use it early in the when he thinks he's getting an off-speed pitch, which also explains why you uses it when he's down in the count because he thinks the pitcher is going to try to get him out with off-speed stuff. This makes sense to me because he's using the toe tap as a timing mechanism to help him stay back on off-speed pitches.

I watched him tonight against the Mets where he faced a lefty and only used the toe tap. He was thrown off-speed stuff on every pitch.

Anyway, I can't be the only person that has noticed this. That being said, I've never read anything about it. It seems important because I've never ever seen this done before.