Sets continue to be played until everyone passes, ending the trick. A player may play multiple times in the same trick. The last person to lay down a set of the given size leads the next trick. This could be five zeroes, but it is played as four. All further sets played in this trick must have a size of four.
All players pass after that, ending the trick.
Red played the last set, and starts the next trick. All players pass. Blue played the last set, and starts the next trick. All players pass. All players pass.