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: @Chan_lfc10 @paul_rule @Nuttall1878 @DeadlineDayLive @Everton We'd be fuming if the hijacked our £8m move for a relegated full back 😡