He said to him, "Most assuredly, I tell you, hereafter you will see heaven opened, and the angels of God ascending and descending on the Son of Man."

 So the two disciples of John followed Jesus. It may well be that they were too shy to approach him directly and followed respectfully some distance behind. Then Jesus did something entirely characteristic. He turned and spoke to them. That is to say, he met them half way. He made things easier for them. He opened the door that they might come in. 