What other reason than misogyny was there for not agreeing it was murder?
What instruction did the judge give them? How was the law explained to them? Did the defence explain that at each step in the process he could have stopped and he showed premeditation in going for the hammer.
It would have been for the prosecution to explain that, not the defence. But a loss of control can be sustained over a period of time that you were 'not in your right mind'. I'm not really sure how I feel about it as a defence - it does seem a bit perverse that in that moment of 'lost control' you can be hell bent on killing someone, but that's not seen as murder in the eyes of law.
But the two manslaughter jurors on tbe blue were ultimately saying, that they think if they were under pressure they don't know what they would do. That doesn't mean loss of control, that means that you too would be a murderer.
That is the nature of the loss of control defence though - that "a person of the defendant's sex and age, with a normal degree of tolerance and self-restraint and in the circumstances of the defendant, might have reacted in the same or similar way." - so it's not unreasonable for the jury to consider (particularly the men of a similar age!) whether they felt they could have reacted in a similar way under that degree of pressure. Personally I can't imagine any circumstances short of mortal fear for my life or my children's lives that I could bludgeon someone with a hammer, but that's not to say that other 'normal' people couldn't imagine being pressured into doing so.