Arbitrations One shot kill

[bibmobello]

3 hours ago, (PS4)thegarada said:

I was playing Valkyr, 1.07K, over 2K armor with adaption and I instantly died around min 16-17. I looked around trying to figure out what killed me instantly, was not sure. I only saw 3 mobs and 1 was nullifer. I assumed there is something I did not see, but there was a none small possibility of it being bug, cuz at this level with my this setup, it normally takes 10 mobs around 4-5 sec of uninterrupted damage to kill me (if I just stand still). This happened 3-4 times before as well. 

What weapon did you have? because time ago i killed myself few times shoting a bubble with a corinth alt fire...