Task: Determine the valence intensity of the sentence, indicating a degree of positivity or negativity on a scale from 0 (strongly negative) to 1 (strongly positive), reflecting the emotional content expressed.
Sentence: Only a few minutes elapse before the daddy of all slashers arrives , still with the boiler suit and white mask , which look remarkably clean for a guy who has been mass-murdering since 1978 but has never been seen doing laundry .
Intensity score: 