Imo
1st, catch, 2nd hit, 3rd fumble, 4th flip a coin or shake the box, whichever rules you use.
Even if they both hit the ball at the same time, the receiver has the catch, if the receiver hits the ball and at the same time the defender hits him, thats a catch, and he falls, thats a fumble, 1. catch, 2. hit, 3. fumble, 4. shake or flip.
P.S. It depends on the wording in your rule set also, if it is a no catch, then your rules should read, if receiver hits target and at the same time the defender hits him and knocks him over, it's a no catch.
Norbert
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