Check out the video. It is only a minute long
Since the 1.1.2 patch and the changes to the sword, there is no reason to cheese the bridge anymore. It is easier to do the bridge legit now then it was to cheese the bridge before the patch. Making soloing and low manning CE much easier and more enjoyable.
Edit: Since this question keeps coming up. The reason there are three gatekeepers is because I was testing the sword out to see how the changes worked. I killed two swordbearers just to see how timing with the sword works. There is no reason you couldn't do what was done in the video with the first swordbearer so you only have one gatekeeper.
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The point of the video is the sword now lasts for 30 seconds regardless of when you pick it up. Whether you want to cheese or not cheese, that is useful information.