[Xander]

Fs as a whole when gone bad, in the temper sense, tend to undermine people and become vicious not in attacking people's strengths but their weaknesses. I think the pattern goes that a T tries to undermine your strengths and an F will aim more for your weak spots (due to being able to see them easier and in more clarity) and will bring down the whole house of cards.

Ns try desperately to piece together patterns which support their fritzing N, which often makes links which no one in their right mind would (most call these "assumptions" but that's over simplifying a little) make.

I've found NFs to show strong ST qualities when underdeveloped or enraged. They are here and now and see no consequences. They become more and more blind to what effect they have on others (a quality most often associated with STs) and have, to me at least, appeared to be completely without vision and diplomacy.

Of course the other facet is the "I'm going to do this and you can go f yourself if you don't agree" but that's more NFJ, I think.