LC: Which OP is she?

From Dota Wiki, all of the interactions:

Dueling units fully ignore disarm. This includes the disarm from Chakram and Flaming Lasso.

If a dueling unit becomes ethereal, it still attacks. It can also be attacked by any unit during the Duel regardless, but still doesn't take physical damage.

If a dueling units gets hexed, or disarmed by Frostbite or Overgrowth, it continues attacking.

However, if Duel is cast on a hero which is already affected by one of the 3 above, it does not attack until they expire.

Duel always has priority over Berserker's Call and Winter's Curse.

Casting Force Staff or Geomagnetic Grip on a dueling unit has no effect, wasting the mana and cooldown.

Savage Roar also has no effect on dueling units at all, not applying the debuff on them.

When casting Assimilate or Aghanim's Scepter upgraded Supernova on a duelling unit, the duel ends prematurely, with no victor.

So, a friendly hero can be saved using using aghs-supernova. Good to know.

Also, what if gissure is cast in B/w them?

They walk over impassible terrain. You can't disrupt it unless you use those two methods there.

Bane's Nightmare for the LuLz!

Are you sure? How do you know that? The wiki is completely unclear about this and tooltips say nothing about it either.

Yes, I've just checked. Even when Duel is cast over impassable terrain(with Aether Lens), duelists approach each other bypassing any obstacles.

Because the wiki is so trash that it doesn't mention a lot of interactions.