I count 7 sec. Also I count 5678 dmg on an enrage choppa...
A 5sec Boiling Blood BW cycle on an debuff enrage choppa do more than that.
Again , it is 4699dmg with one offload skill so it more like 5sec.
You die to TWO WL, the major hitter only hit you for 4661.
An enrage choppa with no armor and toughness to speak of getting hit for 6667dmg in 6sec
Given that you have 7.7k hp ....
None of your evidence show that a WL can kill someone in 3-4 sec