Jim was dead fixed on using that strategy to submit them. For him using his aura to kill anyone to oppose his authority was his best guarantee here.
If he had more time, he would rather play another game with them, but his time was limited. He estimated to have only six hours or even less before his first twenty-four hours advantage ceased to exist.
And with it he couldn't summon anymore warriors.
And he didn't plan on doing so.
"You have an hour to decide," he said to the next batch of warriors before he turned his back to them.
"Grr... Grr..." yet this time two were reckless enough to come at him despite his burning aura.
"Foolish ones like you deserve to die," and he again showed his determination in killing them in cold blood using his sword spell.
'You'll lose many of them this way,' the old man tried to persuade him not to do that.