Question

the next campers were also cleared, but when the fourth smiled at the screen, it flashed red. \denied.\ the voice chirped. the girls face fell as the man pulled her aside, and a quiet buzz rippled through the campers. why was she being denied entry? why did the man pull the girl? the biometric system could not? the girls smile, so she was not allowed to?

Explanation:

The man pulled the girl aside because she was denied entry by the biometric - system. The biometric system likely uses facial recognition or other biometric data for verification. Since it flashed red when she smiled, it couldn't match her biometric data (her smile could be part of the biometric input for some advanced systems), so she was not allowed to enter.

Answer:

1. Because she was denied entry.
2. match; enter