Conscious or not, nobody can judge unless someone crawls into your head. That's why the rule is: If you unnecessarily increase your body surface area and then get hit in the arm, it is a foul.
PS: I don't like the rule. For me, the rule should depend on the result: If the team that handled the ball has an advantage from it, then there should be a penalty. Whether it was intentional or not. For me, that is the only objective and verifiable criterion.
PPS: Even under that criterion it would be a penalty because he deflected the cross, which might otherwise have led to a goal.