On the next day, the multitude that stood on the other side of the sea saw that there was no other boat there, except the one in which his disciples had embarked, and that Jesus hadn't entered with his disciples into the boat, but his disciples had gone away alone.

 It may be well that we should remember that here John is doing what he so often does. He is not giving, or trying to give, the actual words of Jesus. He has been thinking for seventy years of what Jesus said; and now, led by the Holy Spirit, he is giving the inner significance of his words. It is not the words that he reports; that would merely have been a feat of memory. It is the essential meaning of the words; that is the guidance of the Holy Spirit. 