[section=Intro] I believe Purple found this skip in the beginning of time!

[section=Demonstration video] Here's a realistic video of how it would look in a run. The setup is actually very unprecise and will almost always work.

[section=Comparison video] 12-13 seconds saved with a fast setup.

[section=Tutorial] STEP 1 Go over to the right side of the bridge, close to the edge of the grass, and start moving left towards the bridge until the edge of the grass cuts through Harry's right foot. It doesn't have to be precise.

STEP 2 Use L2 to aim the camera so that Harry's head is close to the edge of the tree wall behind him. Doesn't have to be that precise either.

STEP 3 Using the d-pad, hold UP until Harry runs off the edge, and then switch to UP+RIGHT. Harry should always grab some geometry. All grabs will be useful, even the very low ones will make it to the bridge.

STEP 4 Now quickly aim the camera, so that you can more or less hold DOWN to get to the bridge. The ideal position is so that you can see half of the door. That camera setup will allow you to only hold DOWN. Practice this and you'll be able to do it every time, saving up to about 12 seconds if done fast.