I like LeVar Burtonís performance in this episode. He can be a really good actor when he has good material like this.
And notice how Picard refuses to order Worf to donate the blood. He "respects" Worf's decision, so he leaves it to Worf. I guess that's the writers passing the buck to Worf.
Why does Picard even have discretion in this case? Iíd think regulations would be pretty clear on whether Picard has the authority to give this order. If he doesnít, thatís that. If he does have the authority to give such an order and the order could have such great implications for the safety of the ship, then I think he has an obligation to give the order whether he feels good about it or not.