original way:
Wait outside the bridge and run across at the last second.
Problem: OPPOSITE faction slowing/rooting/CCing you
How to do it the EASY way:
1) Jump off the bridge into the water
2) Find that "sweet" spot where you can move a foot either way to enter/exit the zone
To make this work best you need Levitate/Waterwalking/Path of Frost, anything that will let you move quicker on top of the water.
The rest is up to your friends or just luck of knowing when to move it.
I've gotten the honor every single time attempting this even without knowing when the battle will be won.