No matter how many times I have done this level (and it has been so...many...times over several weeks) I cannot for the life of me get the Slytherin (green) part of the shield as I always get killed by the dementors just as I get to it.
I have tried switching to the character who is in the front and hugging the wall to my left so I shorten the distance to travel, I have also tried using a spell against them in particular the Patronis spell but still to no avail...I am going insane trying to work this one out.
Has anyone got a solution to this maddening problem I have ???