Use your " VAULT " skill to get away from the wall and shoot.
When they wall against you or on direction where your going, go opposite way, toward
the mobs, and pass them by.
also you use smoke screen to get away.
If you've got no skill, you should learn how to play.
Use multishot with the rune "suppression fire" , so you won't run out of discipline.
The wall doesn't surround you or prison you; It only blocks your way.
Actually it CAN prison you. As a DH you can literally be trapped for quite a bit of time without being able to move.
Players I run with can sometimes see it happen to me(when I've failed on preempt it). But they never panic though, because they know that I and my DH are prepared and I know what to do, despite it being pretty f'd up.
Herbdoctor only had 2 forms of restoration when he can't deal damage to sustain. That's his 500 life regen with 76k health( :\ ) and default capacity(no bonus) potions. When your health gets into the 70k+ range as a DH, more life regen(whether through Brooding, gear, Aid Station, or whatever), another form of healing(globe bonus for potions or Battle Scars) become boons.
Sure, I'd love for the waller to not spawn it directly on top of me glitched, and would even love to be able to destroy the walls. This thread seems more like a complaint about it after dying(only) though - it's understandable, but I'm just sayin.