Leg Tap

[Judtech]

For my own edification, could I ask for some clarification:

Player A1 is going up for a jump shot...
1. B1 places their hand directly in the face of the shooter
2. B1 attempts to block the shot and in the course of that attempt their hand
ends up directly in front of the shooters face
3. Prior to the shot attempt, A1 is in "triple threat", B1 closes out with a hand in A1 face and keeps it there as A1 attempts their shot.

All legal? I am actually seeing this type of 'defensive' move more and would like to make sure I am on top of the correct rulings and schools of thought.
IMO: (which is chiseled in yogart)
1. Non basketball play. The shooter goes from a clear field of vision to that vision being purposefully obstructed in a non basketball way.
2. Clearly a basketball play
3. Could go either way. Depends on what the 'divined' intent of the defender is. Did the hand intentionally go to A1's face? Is B1 just staying on their feet defensively and their hand and the shooters face end up at the exact same height off the floor.
These are the plays I have seen this spring and any of the afore mentioned thoughts are more than open to change.