りはためいたそうだ
nari hatameita sōda

Godan Verb (ku)
Evidential Auxiliary

Expresses hearsay about a past event ("I heard that...") of 鳴りはためく

1. It is said to have resounded.; It is said to have echoed.; It is said to have reverberated.

Past/Perfective
Hearsay Evidence