The pace that Froch sets, especially considering that he's well into his 30's, is frightening. If Groves avoids a slugfest then he wins the fight. Deep down he knows that he threw everything at Froch in the last fight and he kept coming forward. IMO he needs to conserve energy and not worry about trying to KO him, because it probably won't happen. Its easier said than done though, going 12 rounds without getting tagged by Froch is a hard ask.