She knows he’ll survive anyway. Though she could have taken the femC’s place but maybe just not possible without raising too much suspicion.
Though more interestingly, this means he was here before. Completed his task. Went back. But somehow retained his powers. Or maybe he figured out some...
Didn’t expect to see a Mahabharata reference. Karna is born with a kavacha (shield)
https://mythologyworldwide.com/the-legend-of-karna-the-tragic-hero-of-mahabharata/