Verse 42

अथाभ्युवाचासुरराडाः संस्मृतमिति क्षणात् ।स्वात्मन्येव मनस्यर्थं सभ्रूभङ्गं विमर्शयन्

In plain words

Then, in an instant, the king of the asuras cried, 'Ah -- remembered!' -- turning the matter over within his own mind, his brow bent into a frown.