A pair of expensive racehorses collapsed and died last month under mysterious circumstances just before a race at in Britain, with speculation that electrocution was the cause. The British Horseracing Authority is investigating the deaths of the horses, Fenix Two and Marching Song, but the deaths of the animals are consistent with electrocution. Marching Song was sired by Breeder’s Cup winner War Chant. So far, the cause seems to be from underground cables, combined with the wet ground…