He is always standing in the “Point-Zone”. He must not leave this field and other player may not enter the field. If this is ignored, this is a foul (= throw-in from the side).
He is allowed to move freely within his zone. That means, the Two-Step or Star-Step rules does not apply to him.
The Catcher
can be played anytime and as often as you like. Especially, if the attacking team is trying to catch their ball 3 times in a row, the Catcher reacts like a “Bonus-Player”, because he cannot be defended directly in his zone.
A change of the Catcher is also possible during any game interruption. Must be announced loud and clear.