re: Bryce Harper got tossed for being out of the batter's box

To me, Harper doesn't like the call. He lets the umpire know, digs in, but then it looks like he gets out of the box then Williams starts arguing...in the clip, I see Williams say "...the box..." among other things. Then Harper gets out of the box again. At that point all I see is the umpire telling Harper to get back in and I don't see Harper at all in the frame, then the ump rings him.

I have to think Harper said something or did something that the umpire didn't like when he didn't reenter the batter's box.