Question re death of Chief's mother

[sef1029]

I don't really understand what happens in this scene. Zhao Xinci kills (tries to kill?) a Dixing with his special gun? Why does he make no attempt to negotiate or save his wife? Why does he think she's willing to die? Why is it so urgent that he try to kill this guy?

The bad guy is holding his wife hostage and he does...what? Blows himself and the hostage up? How and why?

Does Zhao Xinci's symbiote play any role in this drama?

And is this bad guy the one who led Butler Wu and others on the expedition to retrieve the Holy Tools?

i don't understand. Someone, have pity on me.