I think, maybe, if Lucy had threatened Klaus's Medcalf defense's backstream with 8.i13, then 9.i1210.j1511.g13, and then 12.f18 would have worked.
Another alternative is 8.i21, because 9.g1710.e21 works, and then 11.k18 isn't so strong anymore. Hmm, this doesn't look as good as what I said in the first paragraph. Maybe then 12.l2013.m1914.n1915.i22 ... no, 14.j1915.o1816.k17 ... no, still no good... Well, Black needed more support to the right to make that work.
Another alternative is 8.i21, because 9.g17 10.e21 works, and then 11.k18 isn't so strong anymore. Hmm, this doesn't look as good as what I said in the first paragraph. Maybe then 12.l20 13.m19 14.n19 15.i22 ... no, 14.j19 15.o18 16.k17 ... no, still no good... Well, Black needed more support to the right to make that work.