The kill proc triggers fairly often now but if it doesn't kill the target it deals 130% atk damage and makes the target flash red.
Dakota finally gave me a decent answer on my bug report for Totemic Warrior. I am left wondering if they flipped the switch on how the Double Death proc works because it's now working most of the time (70%) and deals 130% damage rarely (30%). Below is the most recent response from Dakota:
"Double Death" skill has 30% chance to kill the enemy after it procs. If it misses then it will deal damage with 130% modifier to the target and red animation will appear on it. We hope this will clarify your confusion.
Thanks For Playing Fatal Frontier.