[Annabeth darts when Rikki beckons, then gives a whistle of approval for the grenade.] You can still conserve them - you know, try not to use them unless there are multiple zombies within its reach.

[She scans the area. The grenade took out two, with a third fruitlessly attempting to put out some flames on its arm. But there are two more approaching, lured over by the sounds and souls.]

Can you get your sword back? [She's not sure it's in the ashes or not.] We can corral them, then you should be able to get the rest with just one more grenade.

[Her brain's already making calculations and going a mile a minute as to making just that work, and she probably looks super focused. She's hardwired for this.]