OOP: Brains?!?!?!

[BJ]

No: HPFGUIDX 63518

Just a theory, but I think the thing with the brain was the tendrils 
of thought that trailed behind and attempted to strangle Ron. Why?
When Harry visited his friends in the hospital ward Ron still had 
welts on his arms and it was said Madame Pomfrey told him that 
thoughts could cause scarring deeper than anything else she knew of.

 So really I think the point being made was that while most of the 
group was injured physically it was going to be the thought of fallen 
commrades that would hurt the most.