The current helix 5 mutagen makes the damage on the passive detonation for Eins Zwei die have 100% shield pen.
This means in your third consecutive hit you deal 100% shield pen…
Who would possibly still have shields after two direct Marqui hits? What is the point of this? To twice a day hope you can kill someone who is low health by spending 1-2 minutes watching them pop out of cover and firing only three shots, hoping desperately that you never miss and the shield pen is enough to kill them the third time?
This is just such a terrible option. Eins ZewinCry is very strong. Having a mutagen compete with it is a waste unless the mutagen does something to seriously modify how Marqui plays.
Perhaps change is so that All shots have 50% shied pen? This would actually be an interesting alternative to second shot bonus damage as well as changing how Marqui picks priority targets.