Ncaa pass/crash @ arc--blood rule

[MOofficial]

Need help with two rulings as I don't have my books handy.

Play 1
Player A drives towards the basket and passes the ball to a teammate. After passing we have a crash with the defender in the arc. Does this result in an automatic block because of the arc rule or is the arc non-existent because it was a crash after a pass which would be a pushing foul, not a player control.

#2
A kid who is going to attempt free throws is discovered to be bleeding before the free throws are attempted. He is directed to leave and has 20 seconds to remedy the problem or a substitute/TO must be made. Does the opposing coach get to choose one of the remaining 4 players or is it the substitute who attempts the free throws?

Thank you