Ianto cocked his head at the other boy, finding it odd first of all that someone would be referring to anything as 'way back in the 21st century' when the 21st century hadn't started yet, for him. And then there was the case that his phrasing was really odd there.

"'They're all gone now'?" Ianto repeated, raising an eyebrow at the other boy. "What d'you mean by that? Have they...I dunno, migrated on or something?" It never even occurred to Ianto that 'they're gone now' would mean anything along the lines of what Sulu really meant by that statement.