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The so-called self-preservation was nothing but Han Yu's modesty.
Before coming, Han Yu had guessed that Ito Ayako would be harmful to Song Hanbo, so before setting out, he carried several hand grenades he had come across on a fishing boat in the Eastern Suburbs and Nantian Island.
Hand grenades are light but have formidable lethality, exemplifying ruthless technology. Even if your Kung Fu is impressive, encountering this little toy will still give you a rough time.
When facing Sawa, Han Yu had not wanted to use them. First, they were considered stolen goods, and there weren't many of them—one less every time one was used. Second, Sawa's abilities were quite average, making the use of these gadgets on him rather wasteful.
