This is the twang of the bow Gandiva drawn by Savyasachin. These sharpened arrows discharged off his hands will kill the enemies.
एतत् कूजति गाण्डीवं विकृष्टं सव्यसाचिना। एते हस्तवता मुक्ता घ्नन्त्यमित्राशिताः शराः॥