India bowled rubbish to him and not to a field plan.
Wood, Broad and Anderson is a far different proposition to the Indian seam attack, especially at home.
It also goes further than a mere "leg slip" like you would or should for Ian Bell. Did you see where Cook was fielding to Ali? Silly Mid On. There is more to fielding on side than leg slip or leg gully. Close square leg, closer mid wicket, silly mid on, etc.
S Smith may get through it with another Bradmanesque series. He may not. All I'm saying is that I expect the examination to occur during the series. When it does, Smith had better start glancing the ball along the ground, or shut up shop from the flick and wait for balls on off stump or wider to put away.
But if he cannot flick the ball away without it going aerially (which it has been previously, just no fielders there to take catches), and its length/ back of a length on leg stump, and he has moved across to off, going to be quite hard to defend that ball with control. Even where he doesn't move across to off, can het put away the aerial fluck when fielders are waiting for it.