Yet another one of those "because the plot said so" moments. I haven't pointed every one of them out but... what kind of shit tier bodyguards let someone bring a gun into a room with the person they are protecting? Especially when they know the person with the gun is an enemy of the person they are protecting.
Also, if there's anyone in this story that would crumble under the least bit of psychological manipulation, it would be Eva. If she doesn't end up killing herself next chapter I am going to be shocked and disappointed.