The catcher needs to catch the ball because the ball is still a "live" ball. (Unless it's a foul ball that the catcher wouldn't likely catch that anyway. Any base runners may advance when the ball is "live" at their peril. If the ball is not caught, there isn't much peril to runners running to the next base.
It is ruled a dead ball and each base runner would advance one base.
The vast majority of Balks are called on the pitcher, but a Balk can also be called on the catcher. With runners on base, if the catcher steps out of the catcher's box before the pitcher releases the ball, it's Balk on the catcher. When this happens, it is almost always while attempting to give an intentional base on balls.
In a normal Base On Balls call, the catcher wouldn't have to throw the ball. If it's a passed ball or a wild pitch, the batter is still awarded first base and can't do anything else. If there are other runners and they try to advance and the batter interferes after that, he is certainly called out and the runner will have to go back to the base he started from. But on a normal base on balls, the ball is dead and the runners would only advance if they were forced and the catcher wouldn't have to throw the ball anywhere except to the pitcher.
If the fielder falls into the stands or the dugout after catching the foul, the ball is dead and runners are awarded base from the base they occupied at the time of the pitch.
Runner attempting a steal from first, or a runner caught returning to second base.
A bauck is an illegal move by the pitcher which throws off the runner. If an umpire catcher a pitcher doing an illegal move, all runners on base move forward one base.
Yeah they can. They can only stay put if the ball is caught as a fly.
If there were less than 2 outs and were runners on base, the runners go back to their bases and the batter is out.
Because the catcher has a bunch of equipment protecting him, and reaching home safely means a lot more than reaching any other base, since it counts as a run. DUEUH.
To the cut off man.
In general, if there are base runners, the pitcher should run to cover home. If there are no runners on, the pitcher can just stay on the mound.