It takes only a few seconds for things to go wrong at China Walls. A dramatic video circulating online captures a harrowing rescue at the infamous Oahu surf spot after a woman was swept into the impact zone by powerful waves crashing against the lava-rock coastline. The footage shows the woman struggling in turbulent water as surging whitewater rebounds off the cliffs, creating the chaotic conditions that have made China Walls one of Hawaii's most dangerous ocean playgrounds. As the situation unfolds, a nearby surfer immediately recognizes the danger. View this post on Instagram Dropping his surfboard without hesitation, the man sprints toward the shoreline and into the hazardous wash zone. Timing his movements between incoming waves, he reaches the woman and pulls her toward safety as more whitewater explodes across the rocks. The rescue was quick, but the stakes were enormous.…