I failed to mention this, but actually, A can too. If A1 fumbles the ball and B1 is between A2 and the ball, A2 can block B1 in the back outside the FBZ because he can legally touch or possess the ball after A1 has fumbled it.
Also, "legally" is key here when considering scrimmage kicks. If, for example, K is running down field during a scrimmage kick he can't block R in the back because he can't legally touch the ball (ie: first touching even though not a foul is a violation, hence an illegal act). Therefore, this rule won't apply in this situation. The only way I see it applying is if R caught the ball, then fumbled. K could then block R in the block to get the loose ball because he can now legally touch or possess it.
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