The moment the Beastmen race got involved with the undead in the human city, they saved as many humans hiding within the city. Thanks to the announcement of the Marshal they weren't completely frightened by them. However, maybe it's instinct they would avoid looking at their eyes as if frightened by them. Or maybe this is only a fear heightened by the current situation.
But the children acted differently, they were fearless and stared directly at the eyes of the beastmen with excitement and happiness. Innocence that can only be found in a young one who didn't know much about reality.
Huzi had just saved a mother and son who was buried under a fallen stone wall.
He just glanced at them to check their injuries and said, "Stand up if you aren't injured. Go to that group and don't move around. There are still undead roaming around."