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Spoiler
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heres my retarded theory, the ghost lady said the cross was blocking the sun and some boolchit about the two being together or something..
a. the blonde chick was a templer spy because remember, she worked for abstergo and the cross in the symbol templers use..
or b.
she was the last one of the ghost ladies bloodline so desmond had to do that to stop the inevitable sex. he was going to plow her with and combine the two again..
them having s3x would have may resulted in a baby, which may have been to much? remember, the ghost said she didnt give us a sixth sense..
also, what if the two voices were watching someone live life as desmond in a future animus?
remember, a memory in a memory..
holy fuckchit..i done blew a braincell just now