Once again we're back with young Briony. She's pouting, out by the water, butchering plants that have the audacity to resemble her cousins and self and disappointment.
I enjoy Briony's little slips into her fantasy world when she can't really cope with reality. I used to do this a lot, though I don't recall ever making myself an Olympian. That's a stretch.
At the end of this rather short chapter Briony resolves to stand on the bridge until something really significant happens to her. I actually already read the next chapter and now think that Briony's standards of significance are a bit low. Tsk Tsk.