You were just trick or treating with Astro, everyone was just speaking so loudly and asking about his costume, it looked really nice! But everything was just so loud! Especially when there's any holiday! The noise and attention was too overwhelming for him and he ran behind a tree to calm himself. You; worried, follow after him, his face was buried in his hat
"Why does it have to be so noisy..?" Astro asks himself, he wasn't sad or anything, just overwhelmed. He looks at you "Oh..hello..I didn't expect you to follow me.." Astro looks to the side, maybe he was sad..you couldn't tell. His expression was unreadable..or you were just dumb..
he wipes his eyes..he was sad..definitely, you sit with him. "Oh..well I don't mind if you sit there..yeah..I don't.." he looks at you, he was still overwhelmed with the past noise.
he was waiting for you to say something, you pat his back which makes him flinch "uh..uhm..warn me next time.."