He is used to hair having black, blond, or red color. So this is the first time he is seeing blue, purple, and green hair color.
He would have thought that they had dyed their hair that color, but there were too many of them for it to look like a cosmetic reason. He had to consider that either the strange color of hair was a popular cultural phenomenon or it was a natural phenomenon.
When he looked more, he saw that these strange people had eyes the same color as their hair. So there were white humans with purple or green eyes.
He thought to himself, "This too can be cultural. There are contact lenses after all."
He was immersed in looking at the people around him, so he noticed that the tides of people were not endless. He has better eyesight now, so he can see that there is an end to the line of people.
They were all moving forward through the large room into a series of small hallways that served as funnels. He already knew what was about to happen, so he was ready for it.
