Initial Surprise and Confusion:
When the doctor saw the snake looking into the mirror, he would have been initially taken aback and surprised. Seeing a snake in an unexpected place, especially in a human-like activity of looking into a mirror, would have created confusion and disbelief in the doctor's mind.

Curiosity:
As a doctor, the person would have been naturally curious about the behavior of the snake. Snakes are not known to possess the ability to recognize themselves in a mirror, so this sight would have sparked the doctor's curiosity to understand what was happening.

Questioning the Reality:
The doctor's mind might have questioned the reality of the situation. He might have wondered if what he was seeing was a hallucination or a trick of the light. It would have been difficult for him to accept that a snake was actually looking into a mirror.

Scientific Inquiry:
Being a doctor, the person would have a scientific mindset. The sight of the snake in the mirror would have triggered the doctor's scientific inquiry. He would have wanted to understand the reason behind the snake's behavior and whether there was any scientific explanation for it.

Observation and Analysis:
The doctor would have carefully observed the snake's behavior and body language. He might have noticed if the snake was displaying any signs of aggression, fear, or curiosity towards its own reflection in the mirror. This observation would have helped him analyze the snake's intentions and motives.

Searching for Explanations:
Given the unusual nature of the situation, the doctor would have searched for possible explanations. He might have considered the possibility of the snake mistaking its reflection for another snake or being attracted to the movement in the mirror. The doctor might have also reflected on any previous knowledge or experiences related to animal behavior to make sense of the situation.

Scientific Hypotheses:
Based on his observations and analysis, the doctor might have formulated scientific hypotheses to explain the snake's behavior. He might have considered factors such as territorial instincts, mating behaviors, or the snake's visual perception. The doctor would have thought about how these factors could potentially influence the snake's response to its own reflection.

Further Investigation:
The doctor's mind would have been driven to explore further. He might have considered conducting experiments or researching existing literature to understand if similar incidents had been reported before. The doctor might have consulted with other experts or conducted studies to gain a deeper understanding of the snake's behavior in front of the mirror.

Curiosity and Wonder:
Overall, the doctor's mind would have been filled with a mix of curiosity, wonder, and scientific inquiry when he saw the snake looking into the mirror. The unusual sight would have sparked his interest in exploring the unknown and unraveling the mysteries of animal behavior.