Egu's pulse raced as furiously as his heart was racing. His brain made the calculations following what Tess had said. With everything, it would mean that the missing child was possibly Tess's abandoned baby.
This realization made everything surreal. He looked at Tess with new eyes. No wonder she was always reserved despite having social friends. She probably kept herself that way to avoid ever letting slip that she had a kid she had once abandoned. However, with the emotional overload from finding out the child was missing, the dam blocking her feelings had broken and he was the recipient of the flood.