When I first started playing the Overwatch!
I'm not quite clear fo BASTION and TURRET. I used Torbjorn to defensive then see TURRET icon in decrease of blood, under the front not far from the Sentinels mode TURRET restored  IT, found blood has not gone up, and then I activated the ultimate skill. Until the BASTION was found out that the kill is not their own TURRET. (Sorry I'm not good at English)