After careful observation of Mophus by his friends they decided that the grin on his face was in fact a grimace, that came from having suddenly very tight trousers. "A Painful circulation problem, caused by the restriction of the veins due to a reduced trouser size… Not a very useful spell unless you're a hobbit" suggested the elderly Gando.
Halk, who was normally slow at picking complex things up, but was fast at picking up complaining valkyries, suggested: "Cast that spell on ME, and my clothes will… errr shrink and I'll be as stiff as a wizard's staff and can hold the portcullis up with my strength alone".
Stamm, who was getting a bit annoyed now said in a whiney manner "But myyyy suggestion is the riiiiight suggestion."
Beowuuf's super-fantastic edit:
"Shut up Stamm," said everyone else, "we don't need the solution anymore!"
"Yes you do you dozy morons!" retored Stamm, "all this Vi Ag Ra spells have made the portcullis re-erect!"
Stamm was right (again!). How do you get passed this after wasting Gothmog's FUL bomb?