"So looks a pent-up lion, o'er the wretch
That trembles under his devouring paws."
3 Hen. VI. i. 3.
As Shakespeare had re-made this play not long before, the image may have remained in his mind. We might also read raged, i.e. enraged—
"In war was never lion rag'd more fierce" (Rich. II. ii. 1);
or, with Theobald, chafed—
"So looks the chafed lion
Upon the daring huntsman that ha gall'd him"
(Hen. VIII. iii. 2).