In fact, I was thinking about 2 things :
1) Is it possible to block a flail ?
2) Have you ever seen a sai dealing damages and not disarming ?
IMO, these events can happen.
But I have never seen a flail being blocked by a shield.
I think I have already seen my sai dealing damage without disarming but I'm not sure and I don't have any fight to prove this.
Do you have these kinds of fights guys ? Or do you think it's not possible ?