Well, 1 up sounds like a peak, hence Silver+peak = Silvertine.
And in addition, 1 across = Gandalf crossing the bridge, 1 down = Balrog falling, 2 down = he pulled Gandalf with him, and they ended up on Silvertine.
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Tuor: Yeah, it was me who broke [Morleg's] arm. With a wrench. Specifically, this wrench.
I am suffering from Maeglinomaniacal Maeglinophilia.
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