What's the deal with the Queen's Knight?

Hint 1 of 8:

Have you given him the proper hand code message?

Hint 2 of 8:

He doesn't recognize it, does he?

Hint 3 of 8:

Try it again.

Hint 4 of 8:

The Knight *should* know the code.

Hint 5 of 8:

So this must not be the real Knight.

Hint 6 of 8:

Kill him.

Hint 7 of 8:

Then, search him, just to prove that you were right.