Webcomic time is weird, cause this page has been months after the page where Damian said he needed to remember something…. so we all probably forgot too what it was.

Though for him it was a matter of minutes. 

But if you read this as a sequence without the distance of update days then yes, this was minutes ago for us too and only he forgot.

↓ Transcript
Damian looks into the office to find it empty. He walks over to the main desks to then freeze, a blank expression seizes his face.
"I came up here for something..."

Counting his fingers he tries to unblock his mind. "Checked stock, rotated the dates, did the stock take, wrote off the wastage. cleaned up the chiller, put the handset back...."

He then clenches his fists and strains in frustration.
"THERE WAS SOMETHING."

Upon a pause, he resigns to a shrug.
"Hopefully it was nothing important...."