Lol. I think that HPMOR has the best attitude toward apologies. I love the exchange between Harry and Quirrell.
Anyways, good on Christo. While I agree with his instincts towards Rick to this day, I also think that he could have addressed them in a much more mature fashion. Had Christo initiated a dialog between him, Sam, and Lauren at least, and possibly also included Rick (although idk whether that would have been appropriate), a lot of problems could have been avoided.