Luna's shattered consciousness struggles to point out that one of her only friends at this point (you know, the ones that are still alive - that elicits an abrupt, loud sob from her) is trying to speak sense to her, but the part of her brain that's somewhat lucid is highly insistent on completing its catharsis. After all, Luna Lovegood rarely acknowledges her own emotions long enough to realize that she's upset about something, so this is a very rare opportunity.

Sniffling, she shrugs. It appears that this is the only answer Katara will be receiving for a few more minutes.