11. When the Green Knight explains himself, why does he say he did not wound Sir Gawain with the first swing? Why does he say he didn't wound Sir Gawain with the second swing?

The first two swings are symbolic of the first two nights.... nights, during which, Gawain kept his promise.

First in foolery I made a feint at striking, Not rending you with a riving cut—and right I was, On account of the first night’s covenant we accorded; For you truthfully kept your trust in troth with me, Giving me your gains, as a good man should. The further feinted blow was for the following day, When you kissed my comely wife, and the kisses came to me.