Which is why you're different. You don't make hasty judgments, so you are more willing to listen and find the truth.

[Which is how she's justifying this to herself. Long she promised to herself that she would never tell anyone about her visions, which was eventually amended to 'never tell anyone except for other people with future-sight about her visions'. But Leo doesn't have future-sight, and she's still not completely sure that he will even listen to her. Leo may be the type to look beyond the surface of a situation, but she doesn't know how he will react to hearing about impending death.

So she looks out towards the forests surrounding camp, takes a deep breath, and speaks again.]

Two days from now, during a game of capture the flag, a camper from Hephaestus cabin will slip and fall off of a rocky outcropping. He will fall into a narrow gap between two large boulders, and he will die of his injuries long before he is found.

[She has an oddly neutral voice as she says all of this, like she is stating normal facts rather than giving a prediction of someone's death.]