Lee Chum Foon's second and third dagger?

[Wu Wudi]

Lee Chum Foon's first thrown dagger is the famous one: absolutely unavoidable, never failing to find its mark, feared and respected throughout wulin.

But by Lee Chum Foon's own admission, his second and third thrown dagger, should they be necessary (they never are), are not nearly as extraordinary. Why is this so? Is it because he expends so much concentration and inner power in that first strike that he has nothing left in the tank for a second or third strike? And just how much time needs to pass between strikes for a subsequent strike be considered a new"first" dagger and not a "second" dagger following the first?

I think that part about the 2nd and 3rd daggers being weaker was just a joke by LCH. He was known to be a pretty funny guy.

Also, it was kinda a taunt to LCH's enemies whenever he was surrounded. He's daring one of them to make the 1st move by saying that only the 1st dagger is that deadly. Of course, no one is dumb or self-sacrificing enough to make the first move.