[Dazai was mildly amused with the shift from concentration to obvious delight. That, combined with the slight hesitation they had before they extended their hand earlier, and the remark on not meeting humans before arriving here - while he had to give due credit in Diamond's willingness to learn human customs, he wondered at their apparent choice to do so rather than simply carrying on with their own.

His amusement, however, took on a sombre undertone at her next words, and his smile became one of contemplation.

A being apparently unused to even the concepts of permanent injury or death - well. One more thing to mull over in depth later.]

It really depends. If their condition's severe enough, yes, a person can die. If they don't bleed out and are able to get medical attention, maybe they'll live.