That will always remain one of the most bizarre things i've seen in a football match because even after he $#@!s up the touch he clearly looks down, should see the ball in his peripheral didnt go where he intended, he still then completes random spin move. I don't get it... did he really not see the ball like 2 feet in front of him when he looked down?
Since it is almost impossible for him to not see the ball when he looked down....i have come with an hypotheses. IMO, the almost impossible, happened.
I think that in the very moment he looked down....his left arm was in the way of the line of sight of the ball and thats why he didnt saw it. The moment he looks down, his left arm is perfectly positioned between his eyes and the ball. Since Sturaro has a WHITE armband covering his arm... im very sure the ball camoed with it in that angle...enough to disorient sturaro about the trace of the ball. If you look carefully, Sturaro was not looking DIRECTLY at the ball but at a reference point on the floor (like most footballers do to have an idea of their surroundings)...so when he didnt saw the ball (camoed by his armbandages)... he got disoriented and believed the ball was elsewhere. Thats why he does that weird 360 searching for it.
Add to that the certain degree of pressure and nervousness he could have had in that very moment , because of having some players surrounding him...and well just the incredible happened.