Cassius was surprised to see Sheldon get up so quickly, and he adjusted his own posture while listening to Sheldon's goodbye. He did enjoy that he mentioned going out sometime- that would have been cool. "Yeah man, sounds good. Was nice meeting you too, thanks for talking with me." he gave a friendly nod while watching Sheldon start to walk away from the area and towards his apartment.

A part of him thought: was it something he said? But really, maybe Sheldon just didn't want to talk anymore, or he had somewhere to go. Cassius sighed lightly as he leaned back in the bench and stared upwards all relaxed again. He wasn't so good at initiating conversation, but he was always trying and learning from what other people did. He had no idea if he'd see Sheldon again in the area, but one thing was for sure. Luckily he'd recognize him in the chance they'd meet again.