Got me thinking

[SanDiegoSteve]

From Rule 2.00:

A FLY BALL is a batted ball that goes high in the air in flight.

A CATCH is the act of a fielder in getting secure possesion in his hand or glove of a ball in flight and firmly holding it; providing he does not use his cap, protector, pocket or any other part of his uniform in getting possession.

IN FLIGHT describes a batted, thrown, or pitched ball which has not yet touched the ground or some object other than a fielder.

A FIELDER is any defensive player.

The PERSON of a player or and umpire is any part of his body, his clothing or his equipment.

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Therefore, a fly ball can be caught by the catcher after it hits his mask, which is part of his person. He just can't use his mask to make the catch, but it can bounce off of it.