At such point, the "duck" in prison parlance is said to be "downed".
Ducking is perceived to be a threat to hierarchal stability in prisons.
For this reason, volunteers at San Quentin State Prison are given an anonymously authored eight-page pamphlet describing ducking techniques entitled Downing a Duck (An Inmate's Version) during training in addition to the standard volunteer handbook.
[1] It is thought that Joyce Mitchell and Gene Palmer, employees of the Clinton Correctional Facility in Dannemora, New York, were perhaps ducked by Richard Matt and David Sweat in the 2015 Clinton Correctional Facility escape.
[2] The concept of ducking is also discussed in the 2019 film Heartlock.