Genn wins in Stormheim. Sylvanas's entire plan hinges on getting the lantern and he destroys it. Then despite being an old man and Sylvanas having a clear shot at him she does nothing while he walks off. There are many cases where you can call plot-induced stupidity in her favor but Stormheim is genuinely the exact opposite - not only does she completely fail in her objective but the one to survive when she has no reason not to kill him is her opponent.