Some people thought while using Kingpin, you’re suppose to be invincible when your health is less than or equal to 50%. That’s unfortunately incorrect.
If you take more damage than your current HP value, you’ll be sent to Swan Song or even get downed if you don’t have Swan Song’s skill.
What may have happened is that you get enough HP to avoid the less than or equal to 50% clause, then you get shot down to 0 HP before you have a chance to respond.
A lot can be said about Kingpin, but when you get shot down while using your Injector, what’s the point in using Kingpin when you can use a different Perk Deck for that situation. Anyway, if you want, feel free to leave your thoughts in the comments below.