In the mission setup for this mission, it says
"Heroes on Skiffs gain: 1 (strain icon): Choose an adjacent, small, hostile figure and test (strength icon). If you receive 2 or more successes, place that figure in a space adjacent to the corresponding skiff ladder...If that figure is placed in the Sarlacc Pit, it is defeated."
So, heroes on a skiff can spend a strain to throw somebody off a skiff if they get two success on the following skill check.
Under the Khetanna event:
"Figures on the Khetanna Deck follow the same rules as figures on skiffs."
And the Khetanna's ladder is right next to the Sarlacc pit and can't be moved.
So, if a hero is on the Khetanna, he can use the above ability to throw an enemy off the Khetanna, into the pit, killing them.
The thing that confuses me is, it appears that a hero can do this multiple times per activation. It's not once per activation -- it's not even an action.
So, for example, Garkhaan(or many other heros) can very easily get 2 success on a strength check.
Consider the following:
-Many figures are clustered around Gaarkhan on the deck of the Khetanna. Stormtroopers, Darth Vader, whatever. Gaarkhan is upgraded to have 5 endurance via a class card. On his turn, Gaarkhan tests strength 5 times, using up all his strain, and throws 5 figures into the pit (assuming he passes all rolls). He rests, getting 5 strain back. He then takes a move action, and starts moving around (5 speed) on the deck. As he moves, he stops several times such that he is adjacent to enemy figures, and each time he uses a strain to throw an enemy off the Khetanna. He does this 5 times, using up all his strain. So, for his activation, Gaarkhan has moved around and killed 10 enemy figures. And this is just one hero's activation.
Is this reading correct?
Since most figures that can be deployed on the Khetanna deck are small figures, it seems trivial for the heros to just wipe out anything standing on the deck. Darth Vader? In the pit? 10 stormtroopers? Get in the pit.
This seems pretty easy for the rebels tbh.