It's clear that what attracts the Aliens is not the blood on the protective suits, because there are many injured Players on the train, yet the three people who were killed were uninjured.
If the flickering, water-like entity that appeared and disappeared is indeed an Alien, it seemingly lacks both scent and sight from what is apparent. However, it can accurately locate the protective suits without any sign of moving liquid spots around, indicating that it likely reacts uniquely to traces of its kind.
Xu Huo turned around and said to the fortune-telling female Player who followed him: "Ask around in the second carriage if anyone else has touched the water on the Alien, whether they've changed protective suits or used Cleansing Potion."
The fortune-telling female Player immediately headed towards the second carriage upon hearing that.
