amazing episode, even more so with the tech details--before and after Root's torture, the show was actually broadcasting Morse Code at a frequency that Root mentioned, a frequency that old people can't hear. Someone actually decoded the transmissions (Machine's dialogue in Morse Code is in Courier all caps):
before Root's ear bone was sliced:
"SORRY"
during Root's conversation with Control:
"INCREASED PERSPIRATION. HEART RATE AND BREATHING ELEVATED. INDICATIVE OF FEAR."
Root: "You're scared of me."
"2 OCLOCK. 2007 ANTERIOR CRUCIATE LIGAMENT TORN. SURGICAL REPAIR PARTIAL SUCCESS. 2010 PHYSICAL THERAPY DISCONTINUED AGAINST DOCTORS ADVICE."
Root: "All these guards watching... by the way, that one has a bum knee."
and right before Root jumps on Control:
"8 OCLOCK."