2v3 on the pass in our half. Tolkin could've done better in slowing the pass to the left or fouled to stop an obviously dangerous attack. Long runs away from both the ball and the open attacker on ORL's left (yes, Duncan's attacker, but you need to cover situationally).
Not absolving anyone else, but Duncan made a critical error to start the play, and then was so far out of position that he was unable to get back to deflect the shot out.
With 4 in the back, he had no cover.
The center backs each had someone to cover.
It's a team game and high pressing by wingbacks often results in situations like these. It's not like Duncan was freelancing and doing something against tactical instructions. Yes, the error sucks and I'm sure he knows it, but the goal is not only on him.