Herbert is currently in something of a note taking fugue state, so it takes him a moment to respond to his name and properly look up instead of up and down between his notebook.

"Mm?" Foster has stopped the procedure, which is honestly what makes him attend the most. "Oh....no, don't mind my being here, I'm only...writing a few things down?" He gestures forward with the hand holding the pencil. "Continue." And then he goes back to finishing off writing down his last few observations.