Natyashastra
ततो रौद्ररसं श्लोकं पादसंहरणं पठेत् । तस्यान्ते तु त्रिपद्याथ व्याहरेत्पारिपार्श्विकौ ॥ १३२॥
Then, a verse embodying the Raudra (ferocious) sentiment should be recited, accompanied by the drawing back of the foot. At the end of that, the two attendants should utter a three-footed (metrical) statement.
english translation
tato raudrarasaM zlokaM pAdasaMharaNaM paThet । tasyAnte tu tripadyAtha vyAharetpAripArzvikau ॥ 132॥
hk transliteration by Sanscript