Hiss

Yes, Khan saw himself as expendable. Yes, he didn't mind suffering, nor did he give his life much value. However, so what?

Khan had dived into the deepest aspect of his desperation to summon his element's full power. He had made that original feeling his core and the whole reason for his being, but that didn't imply wishing for his death.

If anything, it made Khan disregard the dangers to his life to achieve his goals in his unreasonable ways. It made him accept mutual destruction as a viable option if it allowed him to avoid compromises.

The thunderous noises in the air bubble grew louder as a purple-red star started to shine inside it. The lake's pale green glow receded as an unstable lightning bolt materialized above Khan's palm, and sealing his fingers around it turned its crackling into a deafening roar.