The tension between Abe and Aaron comes to a head after a late-night encounter with Thomas Granger (father to Abe's girlfriend, Rachel), who appears inexplicably unshaven and exists in overlap with his original suburban self. Granger falls into a comatose state after being pursued by Aaron; Aaron theorizes that, at some unknown point in the future, Granger entered the "box", with timeline-altering consequences. Abe concludes that time travel is simply too dangerous, and enters a secret second box (the "failsafe box," built before the experiment began and kept continuously running), traveling back four days to prevent the experiment's launch.