Tua injured his 5th metatarsal on his first TD pass against Louisville here...
Walked off the field under his own power and came back in the next series and continued throwing touchdown passes. He reinjured the same metatarsal taking a sack against Georgia later in the season in the SEC Championship Game where he got the same foot caught underneath himself and the defenders on top of him. Again, he stayed in the game until Jonah Williams stepped on his other ankle.
If anybody has ever watched enough Tua tape, they know what the injuries are and the exact plays where it happened. For all those that don't and haven't - it's easy to talk up all the injuries and confuse people. Which has been the point all along.