AJo in the sb debate

[jkamowitz]

So I was watching the 50k HORSE event on ESPN and the following hand occured (I dont think the players are really important, maybe they are but for sake of discussion I'm omitting famous names.)

Player in the co looks at his cards and excitedly opens, pro calls in the sb with AJo, BB calls.

I was talking about this with a friend who exclaimed "I 3-bet instantly there" And I was a little more understanding of the call.

Before I give my own thoughts, I'm curious what people think about this spot as it happens frequently in both tournaments and cash games.