"You can't...remember anything?" For a second she sees Kyle in Jeremy's place, drugged and amnesiac to the point where he couldn't remember his own name, before reminding herself that this is the here and now in the Games. Still, Luna wonders if someone could be messing with the Tributes via chemical means as well as everything else she's seen the Arena. She can't exactly put it past the Gamemakers, and it could make for some good drama for viewers too.
But that's far from the only possible reason for Jeremy's current problems, and generally the simpler explanations are the more likely ones. Better to start simple, too. "I can't help with your memory, but right now we're in the middle of the Hunger Games. People fight to the death here, and then they'll be brought back to life to do it again...but I'm not interested in hurting you. I promise." Important caveats in case he feels (justifiably) jumpy right now.
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But that's far from the only possible reason for Jeremy's current problems, and generally the simpler explanations are the more likely ones. Better to start simple, too. "I can't help with your memory, but right now we're in the middle of the Hunger Games. People fight to the death here, and then they'll be brought back to life to do it again...but I'm not interested in hurting you. I promise." Important caveats in case he feels (justifiably) jumpy right now.