Board Thread:News and Announcements/@comment-24179430-20150508150547/@comment-25375217-20160810125630

I guess we're talking about Shattered Sight then? It's 4x10 but 4x09 doesn't have any references that I can think of (and I just rewatched the Frozen arc so in theory I should remember)

In Shattered Sight, David only says that she hit him in the face without specifying rock vs. box. So it's not an error.