There are 2 different examples above:
@Michielos with 3 players, A,B and C: Indeed B should have had a chance to block IF he really did have a captain, which would require evidence as bluffing and table talk lying is a MAJOR part of this game. But yeah if Player B did have a captain then he should have been able to block.
@truecolors with 2 players. Player B is immediately eliminated after making a false accusation, so the result of the action does not complete and A does not get any money from B.
@Michielos with 3 players, A,B and C: Indeed B should have had a chance to block IF he really did have a captain, which would require evidence as bluffing and table talk lying is a MAJOR part of this game. But yeah if Player B did have a captain then he should have been able to block.
@truecolors with 2 players. Player B is immediately eliminated after making a false accusation, so the result of the action does not complete and A does not get any money from B.