I have faltered in my loyalty, before. I am making sure I never do so again.

[Lancelot would have been confused by the prospect of fairies 'choosing sides', himself. The fairies he had gotten used to were tricksters who often times cared little beyond the moment. For them to hold grudges or cast allegiances would have simply made him wonder if they were fairies at all.]

They're 'nymphs', or elemental beings that represent the territory they frequent. Beings that come from the nature that they frolick in.

If you pledged your aid to them, my lord, it would be the same as allying with 'Nature', itself.