Even though he’s already seen a contestant medivaced out of the Australian Outback after falling into a fire (you can relive that moment after the jump), Survivor‘s Jeff Probst said last night’s incident with Russell Swan frightened him. “It was the scariest moment I’ve ever had on this show…nineteen seasons I have never been more afraid in my life of how bad things were.”

During a reward challenge, Swan collapsed in the middle of the competition due to hydration. Although the severity of the problem was initially unclear (all of the survivors were blindfolded), Probst immediately paused the challenge once he recognized the situation. The challenge was later canceled altogether.

“For the next 45 minutes we monitored Russell’s vital signs. We gave him water from his canteen. We gave him oxygen. We propped him up and gave him time to try to relax and get calm,” Probst detailed for Entertainment Weekly. Although there are times contestants return to the game after a visit with medics, the 42-year-old attorney was never given a choice. An unexpected drop in blood pressure forced the producers to end Swan’s run for him.