I know we all half jokingly say to be physical with an injured player, but this idea is completely ethical and legal if done with sportsmanship. In any sport, if a member of the other team lets it be known that he's playing injured, you HAVE to take advantage of the situation.
Anytime Rip goes for a layup, there is nothing wrong with giving a hard foul to his shooting arm. As many have said, hard picks should always be set, so this is fair as well. Run him into picks in such a way that it's on his right arm that he's getting contact.
This is what a series is all about. You need to take advantage of opportunities when they arise. Call it luck or whatever, but if Rasheed starts getting crazy, I see nothing wrong with provoking him to lose his mind out there. We just need to play by the rules and take advantage of their injuries/lunacy.
Finish them.