Throw-in/Backcourt violation?

[Zoochy]

4 plays. Legal or violation? And why!!!

(1) Throw-in for Team A near the division line in their front court. A1’s throw-in is deflected by B1 who is applying direct pressure on A1. A2 jumps from their frontcourt, catches the ball in the air and lands in the backcourt.

(2) Throw-in for Team A near the division line in their backcourt (Team B’s frontcourt).
A1’s throw-in is deflected by B1 who is applying direct pressure on A1. B2 jumps from their frontcourt, catches the ball in the air and lands in the backcourt.

(3) Throw-in for Team A near the division line in their backcourt (Team B’s frontcourt).
A1’s throw-in is intercepted by B1. B1 had jumped from their frontcourt, caught the ball in the air and lands first foot in the frontcourt, second foot in the backcourt.

(4) Throw-in for Team A near the division line in their front court (Team B’s backcourt). A1’s throw-in is deflected by B1 who is applying direct pressure on A1. B2 jumps from their backcourt court, catches the ball in the air and lands first foot in the frontcourt, second foot in the backcourt.