At the beginning of the year, the Royals bullpen was very nearly historically bad. From March 29 through April 21 the Royals bullpen amassed an 8.41 ERA and a 6.14 FIP. They walked very nearly as many as they struck out and only stranded a little more than half the runners they allowed.
Since then they’ve struck out more batters in fewer innings and walked half as many on their way to carrying a unit ERA and FIP of 4.12 and 4.25 respectively. They even improved their strand rate to about league average at 73.4%. If you were wondering if there was any particular reason I chose April 21 as the cutoff date, you’d be on to something.