sya the sign of Future and Conditional gets the augment iṭ after a root ending in short ṛ and after han 'to kill'.,
As करिष्यति, हनिष्यति, हरिष्यति ॥ The root स्वृ takes always इट् before स्य, though it does so optionally before other affixes (see 7.2.44): as स्वरिष्यति ॥ Similarly अकरिष्यत्, अहरिष्यत्, अहनिष्यत् &c ॥,