cks ▁himself ▁in ▁the ▁inter rog ation ▁room ▁to ▁talk ▁freely ▁with ▁wrong ly - acc used ▁Sh eld on ▁Haw kes , ▁F lack ▁def ends ▁Mac ▁to ▁his ▁Captain , ▁saying ▁that ▁they ' d ▁do ▁the ▁same ▁for ▁each ▁other ▁( ep is ode ▁ 3 . 1 1 ▁" R ais ing ▁Sh ane "). ▁F lack ▁and ▁Mac ▁argue ▁again ▁briefly ▁when ▁a ▁serial ▁k iller ▁is ▁released ▁from ▁prison ▁thanks ▁to ▁the ▁a for ement ioned ▁arrest ▁of ▁the ▁detect ive , ▁but ▁they ▁quickly ▁put ▁aside ▁their ▁differences ▁to ▁catch ▁the ▁murder er ▁and ▁put ▁him ▁away ▁for ▁good ▁( ep is ode ▁ 3 . 2 1 ▁" P ast ▁Imper fect "). ▁ ▁Out side ▁the ▁lab ▁During ▁the ▁final ▁episode ▁of ▁the ▁first ▁season ▁Mac ▁is ▁seen ▁talking ▁to ▁a ▁woman ▁who ▁later ▁asks ▁him ▁for ▁a ▁drink , ▁she ▁meets ▁him ▁again ▁and ▁the ▁episode ▁ends . ▁ ▁In ▁the ▁first ▁half ▁of ▁season ▁ 3 , ▁Mac ▁met ▁Re ed ▁Gar rett , ▁the ▁child ▁that ▁Cla ire ▁rel in qu ished ▁for ▁ad option ▁before ▁she ▁met ▁Mac . ▁They ▁met ▁when ▁Mac ▁caught ▁him ▁following ▁St ella , ▁who ▁Re ed ▁mistaken ly ▁believed ▁to ▁be ▁his ▁mother . ▁Mac ▁offers ▁him ▁his ▁business ▁card ▁and ▁asks ▁for ▁a ▁chance ▁to ▁get ▁to ▁know ▁him , ▁but ▁is ▁initially ▁turned ▁down . ▁In ▁spite ▁of ▁Re ed ' s ▁rel uct ance ▁to ▁keep ▁in ▁touch ▁with ▁Mac ,