Being bound with bark, that powerful (monkey) got himself freed from the binding of the weapon, for the binding force of a Brahma weapon becomes null when there is any other binding.
स बद्धस्तेन वल्केन विमुक्तोऽस्त्रेण वीर्यवान्। अस्त्रबन्धः स चान्यं हि न बन्धमनुवर्तते॥