In Indiana Jones and the Last Crusade, in order to reach the Holy Grail room, three challenges must be passed.
In the first challenge, only the penitent man will pass, which involves kneeling before God. People who fail to do so get their heads cut off by an horizontal saw disc cutting at neck height.
However in the movie, there's a second saw disc, cutting vertically that forces Indiana to roll sideways after kneeling.
What's the purpose of this second disc? It doesn't make sense to me, since it will kill people who should have passed the challenge.
