Significance of Means of killing
The concept of means of killing is elaborated in both the Purana and Dharmashastra. In the Purana, it describes the method employed by the gods to slay Andhaka, who was invulnerable, with Brahma's assistance. Conversely, Dharmashastra defines means of killing as the ability of an individual to indirectly cause another person's death through their actions or words. Both interpretations shed light on different aspects of causing death, whether directly or indirectly, within these texts.
The below excerpts are indicatory and do represent direct quotations or translations. It is your responsibility to fact check each reference.
Hindu concept of 'Means of killing'
In Hinduism, "Means of killing" can be interpreted as (1) an individual's indirect role in another's death through actions or words, and (2) the divine strategies for defeating invulnerable foes, exemplified by the gods collaborating to slay Andhaka.
From: Garga Samhita (English)
(1) The method or approach suggested in the text for harming Lord Maha-Vishnu.[1]
From: Padma Purana
(1) The method for slaying Andhaka discussed by the gods, seeking assistance from Brahma due to Andhaka's invulnerable status.[2]
From: Manusmriti with the Commentary of Medhatithi
(1) The capacity by which an individual may indirectly contribute to another person's death through their actions or words.[3]