Backcourt Violation???

[electronics_project]

A1 shoots and miss. B1 gets the defensive rebound and throws the ball upcourt for a fast break. Before the ball crosses the midcourt line, it was partially blocked by A2 but the ball still rolls across the midcourt line. A3 gets the loose ball from his own half and dribbles upcourt again.

Is this considered backcourt violation against team A considering that the ball touches A2, goes backcourt and is returned upcourt by A3.