Hi there,
As far I can talk about my experience with only four of this specie, I could never observe such behaviour. All the Agkistrodon (contortrix ssp, piscivorus ssp) I have did use this, and it smells quite nasty... I never could observe this with Agkistrodon bilineatus ssp, A.taylori, nor D.acutus. Maybe someone has some more infos?
Cheers
LucasC.