I got this sentence from Boku no Hero S01E13 (06m25s)
Besides, the children appear to be frozen in fear. (translation from the site)
I understand everything except the expresion in the title.
According to Rikaikun, those words mean: 棒立ち= standing upright; standing bolt upright; rearing 様子 = state; state of affairs; situation; circumstances;
So how can 棒立ちの様子 mean "frozen in fear"?