Sozin sounded uncharacteristically serious in this situation, and Mark turned to look at the still-smiling Loki at his side. The god of mischief knew that Mark was talking to his patron god, but Loki did nothing to stop him. Let him consult for as long as he wants. Loki had nothing to lose.
If Mark makes the deal, then Mark would either die or Salazar would die, and if Mark does not strike the deal, then he would have to make it his life's mission to chase after Salazar, worrying at every junction about what plans Salazar might've made for him, and trying his best to protect his family and friends from an enemy whose next face he wouldn't even know.