A follow on because I want to again stress the intimidation factor that Russell brought. With Russell shooters felt like he would block every single shot that came into his area. Russell has said he didn't try to block every shot but he wanted the shooter to think he would block every shot. He largely succeeded. You always got the impression that if he was challenged he would block 20 a game, do it with out fouling and keep 90% in bounds. The greatness of Russell was that the other team always had to change their game plan and the other Celtic player could overplay and funnel their opponent to Russell who always seemed to be waiting.
The other thing is that Russell didn't take silly fouls. If Wilt and the angle for a dunk, Russell gave it to him and didn't also send him to the line. Remember Russell played almost every minute until the game was in hand. He had to block shots without fouling.