Dumbing it down

[lord of dor-lomin]

Please note that I delberately chose an apparently non-controversial change.

You chose wrong. That change resulted in there being absolutely no explanation for Merry's sword. The audience has no clue that his blade is special, therefore the audience assumes that all you have to do to render the Witch King helpless is to have any weak little hobbit poke him in the leg with any old knife- which of course is extremely inconsistent with the rest of the movie where the WK is portrayed as being very powerful.