Potential blocker or not?

[HLin NC]

I believe it is a judgement call.

Well then there is no need to look for further opinion nor have an argument about it

9.2.3 SITUATION C: Quarterback A1 drops back 15 yards and throws a legal
forward pass intended for A2, who is 5 yards behind the neutral zone. Before the pass reaches A2: (a) B1 tackles A2; or (b) B1 blocks A2. RULING: In (a), tackling A2 is a foul, as it is a form of holding. Defensive players are prohibited from grasping an opponent other than the runner. The foul in (a) occurs during a looseball play, and the 10-yard penalty will be administered from the previous spot. In (b), the contact by B1 is not pass interference and, if the block itself is legal, there is no infraction. (7-5-10)

Not sure how this gets any clearer. We can safely assume that if he is the intended receiver, then he obviously NOT a potential blocker.