Determine the valence intensity of the following tweet, considering the mental state of the author. Assign a real number between 0 and 1, where 0 denotes extremely negative and 1 denotes extremely positive.
Tweet: Ha ha love flats description of Marlie packer... Default setting 'combat mode'.... 😂😂😂😂😂  #brilliant \n@davidflatman @MarliePacker #WRWC2017