So I was sent there by Arngeir. Killed the two Haggies and the Briarheart they revived and found the word wall just behind them but it wasn't glowing any word.. The usual music and sound it makes when you get close to an undiscovered wall were playing but nothing was happening.. :/
2 years old but just in case for anyone else. had that happen somewhere else. usual music and sound playing and screen getting a little darker all as per normal, but no glowing word and no "swirling lights" effect or whatever it is when you are "learning" words.
nothing seems to happen by just standing there (i could of been slightly out of range though) but by walking right up point blank to the wall i learnt the word.
so just press right up against the face of the wall were the words are if happens to anyone.