What was the bus trap all about?

Hey

they talk about on page 54 of my book:

"But instead of the graceful glide through the puddle that its occupants were expecting, the bus emitted a tremendous crack and careened drunkenly into our trap.For a moment it swayed and we held our breath, afraid it would topple over. Then it sputtered a last murmuring protest and died, its left front wheel in our ditch, its right wheel in the gully, like a lopsided billy goat on its knees.

OK -

first of all, only the white kids get to ride the bus.

It was about the Logan family wanting to get revenge on the Jefferson Davis school bus because every morning they will walk to school they will get even dirtier than what they was