Undying Maliwan Soldier in Proving Grounds

I was playing proving grounds with zane (dont know if it matters) in the maliwan proving ground i discovered a bug were the last maliwan soldier (Triage Commando) does not die. he only has one health left but does not die. im hoping somebody from Gearbox see’s this. just want to help the game get better and improve.

I can confirm this behavior in certain Maliwan enemies, but this was outside of the Proving Grounds (where I could just leave him behind)… that sounds like a mission breaker.