Each player generally owns the space above their vertical torso. Conact with an extended limb, if sufficient for a foul, is a foul on the owner of the limb.
In this case, the contact was with the ball. Unless it was deliberate, it is nothing.
If B1 had stepped in with both feet on the floor without making contact and obtained a vertical position over A1's outstretched leg, it would be a foul on A1 to contact B1. When A stretched out, he gave up the space above his foot since he was not longer occupying it. He's occupying a different space now and only have vertical rights to that space...not both.
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