Arthur's explanation wasn't helping, and neither was watching Lexi break down and start talking in a voice that was somehow hers and yet also not, with the archaic phrasing and talk of slaying and betrayal. That, mixed with a sting of guilt for something he couldn't possibly have had any part in, and jealousy at the intimacy between Lexi and Arthur, and the rational part of his brain screaming that this was all so far beyond insane...
… god help him, everything in him rebelled against leaving the table, but it was just too much. Besides, this wasn't a moment he was supposed to be watching, was it? There really were only two people at the table.
He mumbled something useless about checking what was taking the other guy so long to make coffee, something he deserved to be slain for himself (because what sort of knight hero left a lady crying?) and fled her side. 'Arthur', or whoever this madman really was, would probably do a better job of calming her down anyway.