Oh that! Yeah it just takes you to the quick reply box. Not sure why you have to hit it twice - might be an iPad thing.

If you want to quote someone or reply to a specific post you have to use the buttons in the grey bar below the post you want to quote/reply to.

AFTER you type your reply you hit the "Post Quick Reply" button to post it. Or you can "Go Advanced" and get a full blown editor with preview functions, etc...