Duffy arrived at the club and played within a few days of signing before being played against Brentford. This meant that he had little or no time to get to know his team mates, and develop an understanding with where they would be on the pitch in training, so of course there is going to be more more of a hoof it away type approach that from someone who has had the opportunity to train regularly with the squad before making his debut (Like Goldson, who scored 2 own goals in his first 2 matches and btw - would he have been in for a lot of criticism and questioning why we signed him if we hadn't had our good start or got something from those games?)
Against Brentford, Duffy was often left in a position where their no. 9 went out to a position on the half way line behind Bruno, who had bombed forward as usual, this left Duffy with a dilemma, does he go wide to cut down that space and try to stop that player early but by doing so, leave the middle vulnerable (especially if someone then makes a late run into the area he vacated and we would be left with Dunk struggling to cover) or does he stay in the middle and let their player run in towards goal unopposed until he gets close to the goal - this is an example of unfamiliarity with the tactics that being at the club such a short time would expose. Also we normally push our centre-backs wide when Stockdale has the ball, but again, against Brentford, Dufy wasn't doing this as much as we normally do and was again down to being here such a short time before playing (Goldson was still injured at this point so couldn't start)
With time, Duffy will (and already has started to) develop more of an understanding with his teammates as he settles in. Goldson had a lot longer to achieve this before he was thrown into action
Nailed it.