What does Beah mean, “Musa had triggered in all of us what we were afraid of thinking?” Chapter 10

In Musa’s story Bra Spider learns of several feasts happening on the same night; while everyone else gathers food and makes preparation for each feast, Bra Spider connives his way into an invitation to every one of the feasts. He puts one end of a rope in each village, tying the other end around his own waist, and leaves instructions for the villagers to pull on the rope when the food is ready. In this way, Bra Spider hopes to quickly arrive at each feast in succession and eat his fill. Unfortunately, the meals are all prepared around the same time, and Bra Spider finds himself pulled in all directions at once. This, Musa explains, is why spiders have thin waists. Musa's story makes the boys think of their own families and their own situation.