deadly force (noun phrase) – use of a weapon such as a gun
red-flag (v.) – mark as incorrect, in error
Pullum, Geoffrey. "Fear and Loathing of the English Passive." Linguistics and English Language: The University of Edinbrgh. 22 Jan 2014. Web. 9 Aug 2014. <http://www.lel.ed.ac.uk/~gpullum/passive_loathing.pdf>.
Strunk, William Jr. and E.G. White. The Elements of Style. 4th ed. Boston: Allyn & Bacon.1999. Print.