The Deadspin write-up has Marisnick's version of the play, in which he claims to "take an in-step and slide head first on the inside corner." (https://deadspin.com/jake-marisnick-should-probably-be-suspended-for-this-1836180059) It's hard to take him at his word, when I don't think I've ever seen a player try to slide to the inside corner of home plate, particularly in the post-Buster-Posey rule MLB where the catcher sets up inside the base line to avoid blocking the plate. Whether rounding third, or leading off 3rd in foul territory (to avoid an out if hit by a line-drive), running to the inside of the plate is a longer distance than sliding to the outside of the bag. That being said, I think it's possible he tried to juke the catcher to the outside, then jump across his body and try to touch home plate. Giving him the benefit of the doubt, it's possible he doesn't realize the throw will bring the catcher up the line to the inside of the plate, thereby cutting off the intended running lane and leading to earlier-than-anticipated contact. (Trying to leave Lucroy's name out of the description is not a slight of the player, so much as avoiding biases relating to an ex-Brewer.) The drop step outside the base line, while otherwise running well inside the base line, gives me pause as to whether it's really a "dirty" play. Marsinick might just be an idiot.