The supplied article text does not contain any substantive content about Onimusha: Way of the Sword's sword-fighting mechanics. Instead, it consists entirely of PC Gamer's website boilerplate, including membership sign-up prompts, newsletter opt-ins and navigation links, with no actual interview quotes or details about the game's combat design despite the promising headline.

As a result, no meaningful summary can be produced from the text provided. To obtain an accurate summary of how Capcom achieved its "realistic, grounded" sword action in Onimusha: Way of the Sword, the full article would need to be retrieved directly from the source, as the extracted content appears to have failed to capture the actual editorial text.