ABC news staged an active shooting scenario with random individuals and it went as expected:

[friendly_iconoclast]

51. Here's the link at the National Academies Press, with "use of gun" defined:

https://www.nap.edu/read/18319/chapter/1

Priorities for Research to Reduce the Threat of Firearm-Related Violence

Pages 15 and 16:

Defensive Use of Guns

Defensive use of guns by crime victims is a common occurrence, although the exact number remains disputed (Cook and Ludwig, 1996; Kleck, 2001a). Almost all national survey estimates indicate that defensive gun uses by victims are at least as common as offensive uses by criminals, with estimates of annual uses ranging from about 500,000 to more than 3 million (Kleck, 2001a), in the context of about 300,000 violent crimes involving firearms in 2008 (BJS, 2010). On the other hand, some scholars point to a radically lower estimate of only 108,000 annual defensive uses based on the National Crime Victimization Survey (Cook et al., 1997). The variation in these numbers remains a controversy in the field. The estimate of 3 million defensive uses per year is based on an extrapolation from a small number of responses taken from more than 19 national surveys. The former estimate of 108,000 is difficult to interpret because respondents were not asked specifically about defensive gun use.

A different issue is whether defensive uses of guns, however numerous or rare they may be, are effective in preventing injury to the gun-wielding crime victim. Studies that directly assessed the effect of actual
defensive uses of guns (i.e., incidents in which a gun was “used” by the crime victim in the sense of attacking or threatening an offender) have found consistently lower injury rates among gun-using crime victims compared with victims who used other self-protective strategies (Kleck, 1988; Kleck and DeLone, 1993; Southwick, 2000; Tark and Kleck, 2004). Effectiveness of defensive tactics, however, is likely to vary across types of victims, types of offenders, and circumstances of the crime, so further research is needed both to explore these contingencies and to confirm or discount earlier findings.