[ Yep, he definitely hears Astolfo before he gets remotely close. So, he has time to casually finish with his save file close the diary.

He's not bothered by him leaning over his shoulder (it helps he knew he was coming), and he's even giving a small wave in greeting as he shifts his head so he can look at him properly. ]

Hey. [ and just casually gesturing to the book in his lap now ] I was writing something.

[ As he twirls the pen between his fingers, he holds the book up just a little. ]

I got into the habit when I was on probation, then picked it back up while I was stuck in the mall with Goro and Kurama.