"Torg and Mara run."
Translation:qet torgh mara je.
Firstly, because there is no verb Qet (to run is qet).
Secondly, because the prefix lu- indicates a third person plural subject and a third person singular object, i.e. "they - him/her/it".
So luqet would mean "they run it".
But here we have "they run" (no object) -- the prefix for this case is the null prefix: qet.