Signs of frustration starting to show for Southampton here as Boufal is booked for pulling back Yacob .
Boufal 's not had nearly as big an impact in the second half as he did in the first .
Signs of frustration starting to show for Southampton here as Boufal , who 's not had nearly as big an impact in the second half as he did in the first , is booked for pulling back Yacob .