Aster was kind of lost in thought as he walked down the corridor, one shoelace untied and trailing behind him, a button missed on his shirt - that is to say, his usual state of semi-disrepair due to his absent-mindedness. His fluff of dark blond hair was also on the edge of chaos due to his habit of running his hand through it while studying.
The flash of the silver sickle in the low-slanting fall sunlight was enough to catch his eye though, bringing him out of his reverie enough to notice Harold. "Oh hi," he said, slowing. He kind of sort of knew Harold, and he was friendly enough to give friendly-looking people the time of day, at the very least.