Barrett made an error, Z showed him up in the dugout, they went down the tunnel shouting at each other and Z sucker punched Barrett in the face and put him in the hospital.
How do you "sucker punch" someone in the face?
What does it mean to "sucker punch" someone?
I always took it to mean to catch someone completely off guard, catching them with a punch which they did not see coming, and could not have anticipated.
But you have described a situation in which Zambrano hit Barrett, in the face, and after they had been shouting at each other and left the dugout.
My memory of Barrett is that his eyes were right there in the front of his face, meaning he would have been able to see any punch thrown to his face, and anyone being shouted at by another person, and who effectively "steps outside" with that shouting person so they are out of sight of others would really have to be pretty slow to be very surprised if the shouts escalated to violence.
Any chance, Deeg, that you might have some general hostility toward Zambrano coloring your description of what happened.... particularly that reference to "sucker punched"?
http://www.thefreedictionary.com/sucker+punchsucker punch
n
1. a sudden surprise punch, esp from behind