[@Tristwich]

'What If' moves should generally be avoided unless you're trying to coral an opponent into a trap. You told me what you'd do if I swung diagonally at you before I made any genuine offensive intent clear. Now, that wasn't my plan, but if it HAD been, you'd have just given me a warning that might have helped me to avoid damage. Of course you might also state such a thing to prevent an opponent from following that train of thought and opening with a telegraphed swing, but I see no reason why you'd not want someone to go for broke and wind up wide open.

Likewise, it's not good because it also may put an opponent into an iffy (and not in a good way) situation if they had actually been planning a [i]similar[/i] move. It might make it look like they saw the heads up and specifically avoided it and performed a slight variation, thus appearing to metagame. 

Again, it's fine if you're trying to herd an opponent, but there are a lot of situations where it's not practical. It usually just provokes opponents to metagame and gives you one less opening. Better to let your opponent make mistakes rather than try to openly corner them. A cornered beast fights harder, after all.