Alex Cabrera took part in full squad workouts at Skymark Stadium on Sunday and ended up boycotting batting practice.
When Cabrera looked over the training menu for the day and found out that he was placed into the final group to take BP, he grew upset (Aarom Baldiris was in the second ground and Cabrera apparently took exception to that) and started moping around.
During situational BP (something he doesn't take part in because it doesn't suit his training methods), Cabrera's frustration levels apparently peaked and he started playing around with a toy gun. The coaches didn't want to cave into Cabrera's moping and ignored him. When BP finally came around, Cabrera was off training on his own and left before everyone else.
Personally, I'd be interested in hearing Cabrera's side of the story.