"Dedust" sounds a bit like "deduce". I guess it was just this new -itis mentioned elsewhere in this forum that does strange things to your brain. 

My iPad corrected dedusting to deducing first of all. Hmm...dust collecting...could this be the start of a new hobby? If so I think I have a head start! Lol

Jepp! 

True. Or dusting a cake with icing sugar (see cooking thread). However in this context it meant getting rid of the dust.

This is after he says: he's my friend, isn't it?

Imogene Tilden wrote:

Hello all, new here   I re-watched Reichenbach last night and noticed something that I can't find discussed anywhere... Right after John checks Sherlock's pulse, and gets pulled away, he says "Jesus no... God no..." He then clearly mouths something else that we don't get to hear. Any good lip readers out there? Maybe what his therapist was asking about?

OMG, yet another reason to watch TRF again? You'd think after 10 viewings and at least 20 of this street scene you're talking about here, I'd know the answer, but I don't.  Time to get the DVDs out again.

Welcome to the forum!

Imogene Tilden wrote:

I wonder if the editing of the therapist scene in the US broadcast ends up making this stand out more. The scene starts with John's therapist saying "... but didn't say it." I read that there was a line of dialogue before this in the UK broadcast that was cut in the US. If we're getting events in the fall scene after the bicycle hit filtered through John (the woozy sound and visuals) then perhaps he never actually "said" those words out loud. Last word looks to me like "him"...

I watched it again,but I don't lipread, so can't make out what John says to the lady who's helping hold him up, just before they take the body away. It's not on the subtitles. Could be anything, I suppose.

Unfortunately, Masterpiece cut some small scenes of TRF, in order to make the show fit its PBS format. Which I didn't know until I bought the DVDs.

The one that mattered the most was directly after the fall, a brief scene of Mycroft in his club, reading a newspaper that was screaming headlines about Sherlock's suicide and being a fake, and then of John, barefoot, in the sitting room of 221B, looking...like he'd just lost his best friend.

That goes directly to the therapist scene (a continuation of the first scene of TRF):
Therapist: There's stuff that you wanted to say.
John: Yes.
T:.....but didn't say it.
J: Yeah.
T: Say it now.
J: No. I'm sorry. I can't.

I have always presumed that meant there was stuff he'd wanted to say to Sherlock and never did, or possibly stuff he wanted to tell her about Sherlock, but never did. Whichever, he didn't feel as though he could (or didn't want to) talk about any of that just then.  This goes directly to him and Mrs. Hudson driving to the cemetery.

@ancientsgate I finally got around to watching the uncut version, and it does take away the apparent significance of that line. Amazing what a little editing can do! (And makes me more than a little miffed.) I would still love to know what he said though...

Davina wrote:

I think it refers to what John has bottled up inside him regarding Sherlock's suicide but also his other unresolved issues with trust and his experiences in Afghanistan. She also asks him, 'Why now? It's been 18 months.' She is encouraging him to talk about his emotions, feelings, grief etc. this is 'the stuff'. Also things he may have wished to say to Sherlock when he was alive, especially before he jumped from the roof, that he didn't. In addition he may also feel that if he had said more, differently, then Sherlock would not have committed suicide.

 
I feel so sorry for John, he always ends up as Sherlocks guinea pig

I always wonder why he went to the same therapist again. I mean it is quite clear that she broke her medical confidentiality when you recall the first meeting between Mycroft and John. (Or they bugged her office or broke into it to steal his record?)
Maybe it is because she is kind of Sherlock related.