Legal Guarding position or Blocking Foul? (Video)

[Raymond]

Close. In slow motion the defender is there before shooter goes airborne. In real time speed the defender appears to get there a split second too late.

My concern is that the Lead guessed b/c when he rotated his eyes were directed towards the on-ball match up in front of his partner instead of towards the paint where he had 2 potential secondary defenders moving into his primary.