For the 1st stage where he stabs through the roof, stand where I stand and his attacks will not reach you. After 5 attacks, he will break the shutter down, this will not hurt you.
Then just bait his single attack on the catwalk and use the spark shot on his exposed eye. Keep your distance when he is attacking, but don't move too far back after the lunge otherwise he will rush you. As you can see, the move is very easy to telegraph. DO NOT fall down from the catwalk until his exposed eye is RED, this indicates one crane will kill him.
Once his eye is red after 7 x spark shots, bait his attack again near where you drop down (to give you time), then jump down and activate the crane. Then just throw the 3 x flashbangs correctly in order to stun him long to avoid damage and for the crane to hit him.
The catwalk is BY FAR the easiest way to damage him as his move is very simple to telegraph, plus his weak point sits in front of you for abt 3secs at a time, easy win!!
![](https://i.ytimg.com/vi/Gs7l0L4boOI/maxresdefault.jpg)