The forum is so slow that I was looking through old threads tonight.  I came across a discussion of a particular case play:  A1 jumps to attempt a try.  B1 fouls A1.  The official sounds his/her whistle.  Before returning to the floor, A1 then charges into B2 who has legal guarding position.
I saw this exact play happen on the last night of camp yesterday.  The official called just the shooting foul against B1, obviously.  But I had forgotten about it and it happened exactly as it's described in the case book.  Jeez, I wish they'd called both fouls.  That would've made a good camp story.