Dirty trick, but illegal?

[Stripe]

If F3 was not moving to position himself for a play but was deliberately trying to obstruct the view of the runner, yes I would take action under rule 9.01 c & d.

(c) Each umpire has authority to rule on any point not specifically covered in these rules.
(d) Each umpire has authority to disqualify any player, coach, manager or substitute for objecting to decisions or for unsportsmanlike conduct or language, and to eject such disqualified person from the playing field. If an umpire disqualifies a player while a play is in progress, the disqualification shall not take effect until no further action is possible in that play.