Groves slowed because he threw so many wasteful shots and put so much on them.

He needs to have it drummed in to him to relax and not tense up so much. Froch said the same about himself that he learnt not to load up on everything in the lead up to the Bute fight.

He also looked a bit confused at the defence of Rebrasse and just threw hooks for the sake of it like he had no idea how to lure Rebrasse in to committing to punching. What Groves did was akin to the fable of the wind and the sun trying to get the man to take his coat off. He needed to encourage him to open up so he actually had targets to counter.

If he slowed down, relaxed and stopped believing any shot he throws is likely to knock someone out he will do much better but I just don't think he's got the mental capacity to change.