I get a good "one one-thousand, two one-thousand" count before he starts moving up the line. And then he's jogging to 1B. The ball is in the RF corner, so the play is behind him after he rounds 1B. The link shows him looking over his shoulder several times before rounding 2B never even looking at the 3B coach. I haven't seen an angle that shows the 3B coach, but it's moot since Rosario never looked at him anyway. If you haven't already, Chief posted a link of the play in a post upthread that you should take a look at. Is it a full-on pose? No, it isn't. He certainly lingers at the plate instead of charging out of the box. And then doubles down by jogging to 1B. That's the point people are making. And those two factors are what turned a triple into an out late in a close game. Those two factors alone should have caused him to stop at 2B.