Keep an eye on that Lion, it could have lodged the piece of food also watch for bloating. When you feed your lion try to feed smaller pieces, your lion will be better off taking 2-3 smaller chunks throughout the day than 1 large feeding.
You can feed raw shrimp, scallops, squid from the grocery store.
I would not feed for about 3 days just to make sure that chunk passed.
They do yawn quit a bit so dont worry if it looks like it's yawning.
Look's Like A Butterfly & Stings Like A Bee!!