Just to clarify, you can also reply to a comment directly from the thread by clicking the Reply link under the comment.

However, for any comment that is a direct reply to one of your own comments, there is a "cooling off" period of several minutes before the Reply link and reply box are available.

chobeat, if you don't see these reply options, please wait five minutes and then refresh the page.

You don't have to wait if you click on the timestamp. That's what the comment you're replying to is saying - there's a workaround to the timeout.

Oh, I didn't know that. Thank you for the correction!