Walking Dead doesn't always make you immortal in PvP

I don't know if it's certain abilities that go through such as execution moves or what, but something always kills me when I'm under Walking Dead. It's Rare that Living Dead actually works properly in situations where you're being hit by a lot of people at once, and I don't mean the animation delay that all abilities of these type share. The actual Walking Dead effect itself seems to just always fail.

ISP:
Service Electric

Type of Internet Connection:
Cable

Internet Connection Speed:
7mbps from 5pm - 1am EST, goes higher to like 35 or 40 outside of those hours

Date & Time:
8/8/2015, 9:49PM EST (Hard to give a time when it happens because it happens at least once per Frontlines match)

Frequency:
Always

Character Name:
Echo Sindria

Race:
Au Ra F

World:
Diabolos

Class/Level:
Dark Knight, 60

Area and Coordinates:
Seal Rock, anywhere

Party or Solo:
Either

NPC Name:
None

Monster Name:
None

In-Game Time:
Any time, seems to happen any time Living Dead is used.

Steps:

1. Go into Frontlines (Seal Rock)
2. Get attacked by a large group of people
3. Use Living Dead
4. Watch as even though it says Walking Dead has been activated, you die instantly anyway
5. Occasionally, you can die anytime during the duration of Walking Dead as well