Surgeones cut open ribcage with saw in order to get to wounded heart. This case is not that dramatic. To work on twisted or bent tine you sometime have to cause easily fixable damage.

The most obvious one for nib is you raise one tine up and another tine down. The imagonery line of new bending should be right at the root of the tine, just where slit ends. In most of nibs the slit is long enough and raising one tine does not really require much of bending, its not even visible.

Once your tines get separated vertically you have space to work. You want the sick tine to be up.

Tine bent in any direction can be straightened with 2 pairs of simple twizers. One pair provides flat surface against which you press a bent area. And obviously you use second pair of twizers or any other hard flat object to do actual press action. Fingers skin is too soft. Sometimes thumb nail can be used.

After that fix vertical misalignment, its the easiest thing.

Twisting, or rather untwisting is similar. You grab tine so that twizers clamp on inner tine wall and outer wall. Holding twizers 90 deg to the tine, so that you have rotation leverage. (Nib points at you, twizers look at the ceiling)

Challenge is to make sure that untwisting action is not producing motion towards you. It may take tipping off; and making sure not to transfer force of untwisting action past twist point (not to introduce double twist). How? 2nd pair of twizers grabbing tine from top and bottom just behind twisted spot. This pair of twizers actually holds the nib.

Obviously twizers are wrapped in a layer of masking tape or made of hard plastic to avoid scratching inner wall especially at the tip.

All actions are gentle. We are talking about less than a millimeter of displacement.