According to Shneidman, people who are ambivalent about their intent to die and whose actions leading to death do not guarantee death (e.g., swimming in shark-infested waters) are called:

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Death darers are individuals who engage in risky behavior that puts them in harm's way, showing ambivalence towards living or dying. Their actions do not ensure death but significantly increase the risk of it.

According to Shneidman, People Who Are Ambivalent About Their Intent