The second part of the Dark Below raid (crossing the bridge) can be done with all characters each with its own strategy. This video is a successful attempt with the Hunter class.
Part 1 - Traverse the Abyss with Hunters Solo
https://www.youtube.com/watch?v=l58MrBk4L1I
Key Notes for crossing the Bridge
1) First start with the gunslinger class with trip mines.
Go to the middle to start the wave. The first sword- bearer will spawn through the back middle. Place a trip mine at the entrance. If thrown correctly the sword-bearer will stall away from the trip mine.
2) The left-side column is the only way to reach the other side. If you time your double -jump and melee perfectly you can make it. Do not worry if you miss the bridge as I did in the video . Guardians will have a second chance through the second route. It will be tricky.
3) Once you make it to the top , hang around the right side cliff. Change your hunter class to blade-dancer.
Hunter Blade-Dancer Class Setup
Arcbolt grenade
Vanish - Arc blade disappear from sight
Escape Artist - Hitting enemies with blink strike (fully charged melee) grants a brief invisibility
Path of forbidden - Increase speed and recovery
Shadow-jack - increases the duration of invisibility effect.
Way of fearless - focused on toughness at all cost
Stalker - Gain invisibility after crouching in place for a short time.
4) Do not worry about the gatekeeper. Clear the minions until the 2 hollowed wizards appear. Defeat the hollowed wizard closest to you as it will be more difficult to charge totem or fight with the ogres if the wizard is not deatl with.
5) Defeating the 2 Ogres is all that is needed to get rewarded for this part. Your first objective is to kill the Ogre at the right side. Use heavy and secondary to quickly finish it. After that you can use the safe spot at the cliff to defeat the 2nd ogre. Take advantage of Hunters crouch and melee invisibility to charge the totem if it turns red.
*Ogres will enrage (turn red) temporarily if enough damage is dealt. This means it will attempt to melee you. Take advantage of high spots to finish the ogre.