[JJ]

Here's the related OBS question I posed to the NFHS, along with their reply -

R1 is trying to score. F2 catches the throw, but before the runner arrives he drops it of his own volition, all the while denying access to R1. Now R1 arrives and contacts F2. Obstruction?

Answer: Yes, since F2 dropped the ball on his own and continued to deny access.

JJ