The corridor scenes for example, where the alien is running down prisoners to their deaths one after another was written like a 'running of the bulls' sequence if you watch.
They are taunting the alien, then running away and hiding, leading it to a central area where they attempt to kill it.
The whole behaviour and speed/size/strength of the alien fits a heck of a lot better I thought, it made more sense infact. When I saw the extended print (apart from it filling in plot holes, like well the fact that several members of the cast just disappear
), it made more sense to me.