GR translation: but knowing more together than they ever have so far

[Mike Jing]

V673.30-39   Christian comes past, downhill adjusting a web belt, not quite
swaggering—night before last his sister Maria visited him in a dream to
tell him she wished no revenge against anyone, and wanted him to trust and
love the Nguarorerue—so their eyes now meet not quite amused nor quite yet
in a challenge, but knowing more together than they ever have so far, and
Christian’s hand at the moment of passing cocks out half in salute, half in
celebration, aimed toward the Heath, northwesterly, Kingdom-of-Deathward,
and Enzian’s goes out the same way, iya, ’kurandye! as, at some point, the
two palms do slide and brush, do touch, and it is touch and trust enough,
for this moment . . .

what does "but knowing more together than they ever have so far“ mean here?
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