Just like the young boy was afraid to eat that piece of biscuit at first, the things others don't have are a kind of original sin if you possess them. Even if you manage to swallow them, someone will still come for you out of jealousy, especially with no adults to protect you.
Now it looked like the children in the area had all eaten the biscuits, so those two kids weren't too conspicuous. But without any adults to care for them, so weak and small, they were the lowest of the low in the slum's hierarchy. Now that they'd eaten biscuits, by nightfall they might be gutted and tossed in the trash.
If eating the same kind as themselves wouldn't bring disease, they probably would've died a long time ago.
Actually, they didn't even have to wait until night. Someone had already come out to steal those two biscuits, all adults. One of them even had a knife.
