I'd say yes and no. I agree you can block a block - no problem from the definition of block. But, to nit-pic the 'same action' statement, I have to say no - after the attack is completed, the action is completed - if the ball then rebounds off the block, the next action from the spiker may be a block or an attack depending on that players action. This is where we apply the 'duck' criteria. This would still apply in the joust scenario.
my $0.02
