Benkei's Weak Point is his shin, which feels acute pain as the nerves run immediately on the shin bone just under the skin, and however strong a man is like Benkei, he sheds tears when he is hit on the shin; hence the Japanese name of 'the place that makes Benkei cry'.
向こう脛は、皮膚のすぐ下、骨（脛骨）のすぐ上を神経が通っているため、非常に痛みの強い急所であり、弁慶ほどの豪傑でもここを打てば涙を流すほど痛いとされる。