In the act of shooting?

[Freddy]

This sit is very similar to a recent state association test question. Something like, "A1, having begun his/her habitual shooting motion, is fouled by B2; the contact by B2 causes A1 to take an extra step (presumably amounting to a travelling violation), after which he continues his shot, which goes in."
As per previously mentioned rule- and casebook citations, the answer was correct that the basket is cancelled, the foul counts, and A1 goes to the line for two shots.
This seems to be in accord with what was stated above.