Etymologies of vampire with pirъ "a feast"

An addendum to Kamil Stachowski and Olaf Stachowski’s "Possibly Oriental Elements in Slavonic Folklore. Upiór ~ wampir" (2017). Etymological propositions involving Old Slavonic pirъ "a feast" are discussed: one by Jan L. Perkowski from The Darkling: A Treatise on Slavic Vampirism (1989); three by Bruce A. McClelland from Slayers and Their Vampires: A Cultural History of Killing the Dead (2006); and one by Michael Dilts, from the remarks in his peer review of this paper.