Seth seems suitably unnerved given the sequence of events, and his clumsy farewell is met with a scornful grunt in the back of Rush's throat as he gathers his laptop and his rapidly cooling coffee in a fluid sweep. Any associate of Jackson's is liable to be just as intimidatingly curious and thoughtful - Rush somewhat fearfully conjures the rest of SG-1 to mind - and therefore a swift escape is doubtless his best option. He slips past the other man with a minimum of contact in a brush of laptop, coffee, annoyance, and suspicion, making an unerring line back to his corner of asocial productivity.