When Santana's ship lands on the planet in Riddick (2013) he orders a transported convict to be released, explaining that this will save them 60 kilograms with which the ship would be unable to lift up.
Is this a true problem or just a licentia poetica / cut-over scene / story dramatisation (to show how Riddick's sorrow channels into fury and to underline Santana's cruelty)?
I find it hard to believe that:
- Santana became aware of this problem only after landing (or we can assume that he knew it earlier, but preferred Riddick over that convict, due to bounty),
- Santana knew this, but Riddick didn't (since he ordered two teams to leave in one ship),
- a single woman / 60 kilograms makes any difference for a huge space ship.
Is there anything that I am missing here?