In the novel itself, Slater (the author) stays in that moment preceding the attack. She writes, "Surely it’s not too late to stop things from going wrong. There must be some way to wake Sasha. Divert Richard. Get the driver to stop the bus. / There must be something you can do" (5).
In context, the author is asking the reader to step in.... yell, scream, attract the attention of the driver and other passengers to what is happening at the back of the bus. Are we strong enough to step in, do we have the ability to stop Richard verbally, physically, or both. Can we set aside our own fears and put the well being of another human being in front of our own.