[ So. Clearly. Confused. Of course, she ought to know who Katniss is. ]
She's a victor in the Hunger Games. [ he's at a loss for how to explain how Lydia wouldn't know Katniss. ]
Other options:
no subject
[ So. Clearly. Confused. Of course, she ought to know who Katniss is. ]
She's a victor in the Hunger Games. [ he's at a loss for how to explain how Lydia wouldn't know Katniss. ]