Bleh

Isn't that what the arrow does? (Which should be a lot smaller and maybe down the bottom of the comment)

No, it just seems that clicking the arrow above a nest of comments collapses the whole thing into an outline of peoples sigs.

It's also messed up for me doing that, showing just a repeat of the same sigs over and over again. Unless you and I have had a conversation in this thread with 100 posts apiece without me noticing.

The repetition is obviously a bug. It is suppose to fold so you can see the next reply to the comment.