The rule is also very explicit that falling down is not a saving factor, but on the contrary is a reason to question the catch if it pops out: It is not a catch, however, if simultaneously or immediately following his contact with the ball, he collides with a player, or with a wall, or if he falls down, and as a result of such collision or falling, drops the ball. Said another way, he needed to make that slide in order to catch the ball. You'd better hang onto the ball all the way - you can't blame the controlled fall that caused you to be able to reach the ball safely in the first place. It's a really well thought-out rule. Brewer fans may naturally feel they got robbed, but they didn't.