Recounting the hoist accidents that were in twins where AEO power didn't even make the difference let alone OEI ability there is a case of a UH-1N (woefully underpowered at altitude) and a UH-60 accident that bear mentioning. The twin Huey accident was in Yosimite National Park, CA in June of 2002 (LTE) and the Hawk accident was on Mount Hood , oddly enough , in May of 2002. They are both involve exceeding the machines envelope in an effort to get the job done. When rescuers get injured or die in the course of trying to help people who got into trouble trying to have fun I can only hope the victims stay away from that particular type of fun if they survive. It is doubly unfortunate and another issue all together when accidents happen rescuing people who don't really need aerial rescue but because we have the capability and the mission drive, we go anyway. The issue of the cost burden, even for rescues that go flawlessly, is yet another topic that is not often discussed (at least in the US). Big difference between snagging someone on a foundering fishing trawler compared to a hiker that gets dehydrated and forgot to bring snacks and water, pulls out their cell phone and gets a ride home (believe me , they get hauled out frequently in the US). Risk assessment is probably more critical in aerial rescue than any other non-military aspect of aviation.