BABIP giveth, BABIP taketh away.
Through 8/20, Crews had a BABIP of .249 and a batting average of .209. For a guy who hits the ball hard (44% of his contact) and is fast, that's absurd.
From 8/21-28, Crews had a BABIP of .435 and a batting average of .323. He's done this with a slight drop in his hard hit rate (39%) and increasing his GB% to 52.2% from 38.6%.
xwOBA up to 8/20 was .315. Since then, it's .327.