Did I Kick This One Tonight?

[Freddy]

A1 is an airborne shooter. His basket goes in, his feet then land on the floor, after which he makes illegal contact (not flagrant) with B1, driving B1 backwards and onto the floor.
I call the basket good, and a common foul on A1, then the ball OOB for B.
Upon locker room review, should I not have rather called an intentional foul, since A1's illegal contact occurred during a dead ball situation after the made basket?
I can't find the reference to support the correct call, other than the obvious 6-7-1. I see 10-3-7 which calls for a T, but the contact clearly was not intentional; that just doesn't seem to fit the infraction.
Isn't there a casebook sitch on this exact play? Any help?