Indrajit, the strongarmed hero, who knew the secrets of all missiles, realising that the son of the Windgod cannot be killed caught him by the divine weapon of Brahma (Brahmastram). [5-48-37]
The monkey leader realised that his speed was arrested by the power of the lord Brahma, by the strength of the bond of Brahmastram. He then recalled lord Brahma's boon to him. [5-48-39]
Hanuman realised that it was by invoking creator Brahma and applying the mantra that he was caught by Brahmastram. On that occasion he started thinking of the boon given to him by Grandsire Brahma : - [5-48-40]