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What counted was contact between the two entities involved in the "fixed point" that River tried to rewrite. The fact that one of those entities wasn't who we (and River) thought it was is beside the point. As it turned out, the "fixed point" wasn't the Doctor being killed, it was the Teselecta, in the form of the Doctor, appearing to be killed. The two entities that needed to touch were River and the Teselecta.