Standard 3-3-1 zone. The disc is with the side handler (one of three back). The cup - consisting of player "A" on the mark, player "B" top, and player "C" on the inner wing - is forcing middle. The side handler (player "H") with the disc dumps it to the middle handler and immediately moves to obstruct player "A" (the former mark) from following the disc. "H" does this in such a way that contact is avoidable, but only if player "A" dramatically alters his (supposed ideal or preferred) path. In effect, H has sealed off one of A's paths (probably his preferred path) to the disc.
Is there a call here or is this clever positioning?
Obstructing the Cup