Bobby found himself tagging along with the group that had formed around Kitty. Other chaperones were corralling their own groups, with the exception of Logan, who exuded such a clearly-defined need for solitude that only Laura Kinney dared encroach on him.
Kitty was in a somber mood, and given the nature of where they were and what she was describing to the younger students, Bobby could see why. And it just didn't seem like the time or place for any of Bobby's usual attempts to lighten the mood, so he kept the jokes to himself and he kept the kids contained as Kitty walked by herself for a short while.