By Adam Cailler A British woman was brutally attacked by a yak while on her way to Mount Everest and had to be flown to hospital. Emma Keen, 42, got a deep 3in cut on her leg from the yak’s horn and was losing a lot of blood. Emma, who manages a shop, said: “Without warning I could hear the hoofs pounding towards me, a sharp stabbing pain in the top of my leg.” “It threw me up in the air around a metre and I landed back down with a thud. I looked and the yak was dragging its hoof in the dusty ground ready to go at me for a second time with his horns down. I screamed and managed to raise my leg…