He doesn't just grunt. He yells, curses at hitters under his breath, and makes all sorts of weird noises. He is an absolute lunatic.I don't watch enough Scherzer starts does he always grunt like that when he's trying to throw his arm off of his shoulder? It's incredibly disorienting. Kind of like women's tennis and the two handed backhand Vasssss Y!!!
OK even Joe Buck mentioned it so maybe it's the special mikes or something.