I believe you are mistaken. Titans do not die during combat but become temporarily inconvenienced by the damage attempting to be inflicted upon them. Titans are actually sightseeing tourists and all they want is a good view of the sunset. But those fallen like to interfere and really get the Titan blood flowing and then the fist of havoc comes out and no ones happy. Why mess with the Titan. Thy are just trying to enjoy the land in their impervious armor.