What makes the author refrain from killing the snake?

The author refrains from killing the snake due to a deep sense of respect for nature and the realization that the snake is an integral part of the ecosystem. He recognizes that the snake poses no immediate threat and that killing it would disrupt the natural balance. Additionally, the author experiences a moment of empathy and reflection, understanding that all creatures have their place and purpose in the world. This moral consideration ultimately leads him to choose coexistence over violence.