Cultivators self-destruct only out of sheer desperation. If there's even a glimmer of hope, no one would choose self-detonation to end centuries of cultivation.
Generally, a cultivator cannot self-destruct unless they've reached the Golden Core Stage. Once at that stage, if they face a formidable opponent, they might choose self-detonation to avoid being killed easily and to take their enemy down with them.
The damage from a cultivator's self-detonation is vast and powerful enough to ensure that cultivators of the same level cannot escape, and it can easily annihilate them.
Yamanouchi Jiro, being a strong cultivator at the Nascent Soul Middle Stage, would create an explosion equivalent to a small nuclear bomb if he self-destructed successfully.
"Boom..."
Yamanouchi Jiro's round body shattered the ice layer confining him. His cracked skin and exposed capillaries clearly showed that he could explode at any moment.
