It's 3 different ways to finish.
1) Fix captan and chief engeneer talk.
2) Fix head prison guard in the brige scene.
3) Fix captan and it's officer talk.

The zombies are attacking kronos when i kill a couple of zombies i cant shoot for a few seconds and the yellow disappears from my fingers,

how exactly what do i do ?

Mark

Run around and catch the yellow thingies to recharge so you need to keep moving all the time.