What he saw when his perception of his surroundings was changing. Because every living thing is made up of different components,
how they perceive reality and other beings will be different from one to the next. So who is to say which reality is the correct one?
However in this case because he was becoming more basic from his other parts dying and with that what they stored information-wise , the perceptors will make the threat appear more dangerous
To activate a flight instinct.
rat man boy band
here is the ratmen if they were construction workers