Oh man, Xireidi could fit the bill for either guardian inspiration or antagonist for this one. They've met before in an abruptly ended thread (Oh shoot, I left that hanging and need to edit an ending. Thanks for reminding me). With equinox almost literally being a creature of oozing darkness that, on the rare occasion, goes up in flame they pretty much fit the bill to set off his eldritch-abomination-dar. Even more so, if in colored memory he thinks that equinox's "just splorin'" statement was to find gembounds to take away then that could trigger some rage as he might think she is responsible for the loss of Gratia.
I could see it going down as Nox casually talking with a youth, Xi misconstrues it as a kidnapping in process and jumps in to rescue, refusing to listen to either Nox or the kid as he thinks he knows the truth already and will not be swayed by the lies. Battle may ensue with last round or round after last setting up to injure Xi enough he can no longer fight. This would set him to have to listen and try to talk his way out of a rough situation.
For Xi, it would set hip up for plotline of waking up his magic again and learning the Recover spell. For Nox she's now have someone keeping an eye on her to make sure she stays an upstanding citizen (which may also act as encouragement to be proactive in looking nice)
That was just one idea, and of course wouldn't be immediate if we played it out; you've probably had your share of fights for a little bit :P
@Equinox