The inquest heard Sgt Thursby, 29, died alongside Private Thomas Wroe, 18, while manning a checkpoint in the Nahr-e Saraj district of Helmand Province on 15 September last year.
Sergeant Gareth Thursby and Private Thomas Wroe, both of 3rd Battalion, The Yorkshire Regiment, were shot dead on Saturday by a rogue Afghan soldier who turned on them after faking injury.