It's mindboggling but not so much if factoring hits and misses and luck, according to persons invested in the craft I've been talking to. Taliban would have been using mountain trails and particular stops that snipers could have taped with hits and misses without Taliban around, similar to lines of fire in regular warfare. JTF-2 wouldn't have gone to all the confirming evidence otherwise, in my opinion. US and Canadian special forces have been working together for decades.