The moment he stepped into the spaceship, he knew that it was time. It was finally time to leave. It wasn't that he wouldn't miss everyone.
He would surely miss them, especially his family members. However as the saying goes, when Tim moves, you must also move. He wasn't willing to stay under his parents' cover anymore. He wanted to grow stronger. So strong that he would be able to take care of his family members when he is back.
He was sure, that it would take a long time. This was very true since the four-season academy wasn't on earth. This meant that there was no way of contacting them apart from using holograms and phones which aren't very effective in that way.
So the moment he stepped inside the spaceship, he was met with a rather funny scene in front of him. Both Bryan and Jim we're looking ahead with a clear look of surprise on their faces. However, what was funny about the situations was their expressions.