As David asked about Jarad's intention, he became stuck in a very difficult position. Jarad is not the most violent man out there. But he sure is not an idiot. He knows that David could probably ruin his entire plan if he comes to Emerald Garden. He had spent the past 5 years working on the plan and he sure wouldn't want a fucker from some corner of the world to ruin his plan. He had invested so much time in this plan. Everything was still in place. And he wouldn't let this chimp lay ruin to his plan
In a sense, he wanted to test David. If he is susceptible to charm, then he would make him his subordinate. He wouldn't tell him about his plan, but as his underling, he would be able to keep an eye on his every move. But if he is not susceptible to charm, he had decided that he would kill him. But not before making him confess about the spell or trick that he used to know that he was indeed wearing a disguise.