Yankees' Aaron Boone gives positive update on Luis SeverinoThusrday's sim game 'another good step'7/29/2021, 9:23 PMRyan MorikFreelance Editorial ProducerFeb 13, 2020; Tampa, Florida, USA; New York Yankees starting pitcher Luis Severino (40) throws a bullpen session during spring training at George M. Steinbrenner Field. Mandatory Credit: Kim Klement-USA TODAY Sports / Kim Klement-USA TODAY Sports