Wells looked at Kaze, who managed to combine being well-dressed and being poorly prepared as his formal clothes were too small, especially given his apparent attempts at athleticism. He wanted to do something humorous for the others, so he made an obvious observation. 

"Porygon could sense her approach from far away. It took a moments to confirm what happened, realizing that its sensors were indeed correct."

Wells let the silence linger longer than necessary. It made sure that the punchline would more powerfully subvert the concealed set-up, making it seem like it stood on its own as much as it was part of a greater joke. When the context of the original sentence faded, he said what he truly meant. 

"Porygon thought she was extremely hot!"