I had no idea what to do.
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My immediate reaction is S4. If white tries to save the stone, you have time to live in the corner. If white attacks the corner, you can attack the stone and move out into the side / center. (Not sure white has any good followups to attack the corner, though.)
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R6 and force white to crawl on the second line.
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I think that the following quote applies (maybe Haylee?)
“If you don’t know how to respond that does not mean that you can tenuki.” 
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