The aliens had landed. What were they going to do? Eat a cow? Why would they do that? Cows are edible unfortunately. The aliens decided to keep the cow alive. They would have milk and biscuits instead.
Their hovercraft would need fuel. So they were going to dance and find fuel from the human place where they got fuel for cars. It turns out their hovercraft would soon be a hydro hovercraft that required water instead. The aliens were not going to stay long. The air was highly polluted and one of the cars honked at them when they landed at the station. They did manage to take a photo of them filling the hovercraft. The aliens were just like tourists.