Why can't Luis Robert hit when Keith Law is there, and more scouting notes

I don't think I'd ever seen a significant pro hitting prospect swing and miss nine times in a game before Tuesday night; maybe I saw Joey Gallo do it in the AZL in his first summer in pro ball, but I can't recall seeing anyone else who was good do it since I started this job. Luis Robert, who seems to hit only when I'm not in the ballpark, did that for me Tuesday night in a Triple-A contest against Scranton when he struck out three times in an 0-for-5 night, which means I've still never seen him get a hit in a professional game.