jack remarking that he's "missed this" while running from danger with the doctor is so crazy like his life since the doctor left him has been nothing but constant danger as the head of torchwood except back there he's thrust into the role of leader as the person who's objectively the most experienced but he's just some guy!! he doesn't know anything he's constantly fucking up and put in impossible situations and ruining things and we even see how easily the team organises in his absence. like clearly he did not miss danger he just missed having someone who can tell him which way to run from it....