Baseball rule when Milton Bradley threw the ball into the stands?

A player hits the ball and heads toward first. When an opponent fields the ball and throws it over the first baseman's head and into the stands, the player can go to first and then to second. He can go to the base he is going to and one more. The same thing happens if it goes into the dugout. If the player had touched first base and started heading for second when the ball flew over the first baseman's head, the runner could have gone to third. Usually, the runners are glad when the ball hits the wall and does not go in the stands because they are fast enough to make it to second and if it hits at the right angle he can make it to third.