I believe (no rules book handy) a foul by B1 here would be a personal foul. I think if B1 reached across and fouled A1 OOB, it's an intentional foul (combined with the delay warning or T). If B1 reaches across and hits the ball, automatic T (and warning if the warning hasn't been given). Here's a hint; try to get the reach before the contact if you can.
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