Sambuka was slain (by Rama) because he was making penance which was forbidden to him by Vedas as he was a "Shudra" (Uttara kanadam, Chapter 76).
Looking at is hand Rama said the Sanskirt slogan "O right hand, you kill this Asche Shudra unhesitatingly as killing this Shudra is the only way to get back the life of the deceased Brahmin boy."
Rama disfigured and mutilated many women by cutting off her noses, bre*sts, ears etc., and tortured them (Soorpanaki, Ayomuki).
