[Poetic Justice]

Originally Posted by aohige

Well, it could be as simple as the intention of the person.
You punch someone with the intention of hurting him, you hurt him.
You kick someone with the intention of stoping his kick, you stop him.
You want to know the opponent next move, then you know it.

Some people might be thinking too hard about the technicality of this, but I think haki is, as the name suggest, simply a power of will.

Nice hidden text there.