fnshtr,, is got it right. He placed his decoy to put some sort of sight block between him and the bird.
Using a blind is all a matter of personal options. I killed one bird from the blind and two without the blind. I prefer without. The blind is devastating to the turkey. You take away his most keen sence,,EYESIGHT,, Plan your setup, use the sun, use your decoy, use a brushblind or popup blind to take your bird. Its all up to you and how you want to get the job done. Do some scouting and plan your hunt as best you can.
Have a safe a happy hunt,,JB