Valmiki Ramayana 6.70.21

ततश्चिक्षेप शेलाग्रं नीलस्त्रिशिरसे तदा।तद्रावणसुतो धीमान् बिभेद निशितैः शरैः॥

tataścikṣepa śelāgraṃ nīlastriśirase tadā |tadrāvaṇasuto dhīmān bibheda niśitaiḥ śaraiḥ ||

Our plain-language meaning of this verse is waiting for scholar review.