質問: The complete sentence is this: ハンジは仲間を喰った その巨人の腹をかっさいた I can't really understand the meaning, why is it ハンジは istead of ハンジの? Then we have 腹をかっさいた. 腹 means stomach while かっさい means to cheer, to make an ovation? Thanks for your help.
回答: It needs to be ハンジは and not ハンジの because it is the subject that performed the two actions described --- 「[仲間]{なかま}を[喰]{く}った」 and 「その[巨人]{きょじん}の[腹]{はら}をかっさいた」. 「その巨人」 refers to the 「仲間」. 「かっさいた」 = 「かっ裂いた」 = "ripped open" said in the animated tough guy language using 「かっ」, a verb prefix for that purpose. "Haiji ate his friend. He ripped open the giant's abdomen." For your reference, other emphatic verb prefixes include 「おっ」、「つっ」、「とっ」、「ひっ」、「ぶっ」、「ぶん」, etc. Unfortunately, these are rarely interchangeable. I will not get into that here, though.