Ok... so back to the Mariner / Boston play...
IMO, Beltre had secure possession of the ball and then went and tagged Manny - either on the shoulder or the helmet. This contact with Manny, which imo caused the ball to "pop" out of his glove and thus lead to the juggling of the ball by Beltre before he finally secured it.
So even as a Mariner fan (I don't believe I just admitted that
) I disagreed with the call.
The Mariner TV announcers seemed surprised at the call to... They even mentioned that because Manny didn't slide it helped the umpire call him out.