On "canned responses" :
Take a page from decades of court evaluation of LEO statements: Avoid the canned responses. Instead, be aware of how to say things, a variety of things, in such a manner that you aught be able to (a) convey the facts and (b) protect yourself. They are not mutually exclusive.
"I was afraid" tells about as much as "I did it for officer safety," which is not much. And people in the business know that, and how to exploit it.
Meriam Webster's: Main Entry: ci·vil·ian Pronunciation: \sə-ˈvil-yən also -ˈvi-yən\, Function: noun, Date: 14th century, 1: a specialist in Roman or modern civil law, 2 a: one not on active duty in the armed services or not on a police or firefighting force b: outsider 1, — civilian adjective