Eragon

I just realised what seems to be a fatal flaw in the Future Step technique:
"You can dodge all attacks in the opponents next post for 750 ki."
Whats wrong with this?
Take this hyptothetical situation:

USER 1:Future Step
USER 2:Uses no ki attacks since he'll just dodge.
USER 1:Lost 750 ki for nothing.

As compared to:

USER 1:Attacks with 300 ki
USER 2:Attackjs with 300 ki

Thats the problem; future step means your opponent can just NOT use ki in their posts, so you lose 750 ki for nothing!

Is this what is meant to happen?

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