Uggggggghhhhhhhhhhhhh.
I despise transposition effects that have a "disappearing" card.
It makes no sense and leaves unanswered questions:
- Where did the 9 of clubs go?
- Why did you hand the wrong card to the spectator in the first place?
- How does the "9 of clubs" (the card in their hand after you "steal" the 6 of clubs) change into their signed selection?
Note that I"m not looking for answers, I am simply stating that these are the questions running through the spectator's mind after the effect.
Make sure your tricks make sense.
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Your handling is okay, you were a little nervous, but whatever.