ark ▁to ▁score ▁four ▁goals ▁in ▁one ▁game ▁since ▁O wen ▁N olan ▁in ▁ 1 9 9 5 . ▁H ert l ▁was ▁eventually ▁named ▁the ▁October ▁Ro ok ie ▁of ▁the ▁Month , ▁scoring ▁eight ▁goals , ▁which ▁led ▁all ▁ro ok ies , ▁and ▁ 1 1 ▁points ▁in ▁ 1 3 ▁games . ▁However , ▁on ▁ 1 9 ▁December ▁against ▁the ▁Kings , ▁H ert l ▁injured ▁his ▁kne e ▁after ▁a ▁collision ▁with ▁D ust in ▁Brown , ▁and ▁is ▁reported ▁to ▁miss ▁at ▁least ▁a ▁month . ▁H ert l ▁had ▁surg ery ▁on ▁his ▁M CL ▁and ▁P CL ▁in ▁his ▁right ▁kne e ▁on ▁ 3 1 ▁December . ▁A ▁former ▁N HL ▁tra iner ▁stated ▁that ▁the ▁" best - case ▁scenario " ▁for ▁H ert l ' s ▁return ▁was ▁approximately ▁twelve ▁weeks , ▁though ▁Kevin ▁Kurz ▁of ▁C SN ▁Bay ▁Area ▁wrote ▁that ▁H ert l ▁could ▁be ▁out ▁for ▁six ▁to ▁nine ▁months . ▁On ▁ 1 1 ▁April ▁ 2 0 1 4 , ▁H ert l ▁was ▁cleared ▁to ▁return ▁to ▁the ▁Sh arks ▁against ▁the ▁Colorado ▁A val anche , ▁ending ▁a ▁ 4 5 - game ▁absence . ▁On ▁ 1 7 ▁April , ▁against ▁the ▁Kings , ▁H ert l ▁scored ▁his ▁first ▁career ▁play off ▁goal . ▁ ▁On ▁ 2 9 ▁June ▁ 2 0 1 6 , ▁at ▁the ▁conclusion ▁of ▁his ▁entry - level ▁contract , ▁H ert l ▁agreed ▁to