''Bautista connected off righthander David Robertson (2-4) in the eighth, one at-bat after taking exception to a head-high pitch from Yankees starter Ivan Nova, who was making his first career start. Both benches and bullpens emptied when Nova fired one over the head of catcher Francisco Cervelli to begin the sixth. Bautista exchanged words with Nova and took several steps toward the mound while plate umpire Jerry Meals warned both dugouts. Yankees manager Joe Girardi raced out to get between the two, and there was no physical contact.''
Of course you have to bear in mind their pitchers aren't ejected even after a warning, so, it's easy for them to throw at people.