Rise of the Tomb Raider: Attack Trinity to lure the helicopter out, walkthrough Rise of the Tomb Raider guide, walkthrough

There is no single way to cross this one, and the following locations, which are packed with enemies to the brim with enemies. Try to move around and dash from cover to cover, because enemies are throwing lots of grenades. It is better to try to kill them out with the rifle at a longer distance. After you kill out all of them, use the explosive arrow to destroy the heap of metal blocking the way. Also, make sure that you still have, at least, one explosive arrow left...

... which you are going to use right around the corner, against opponents on the plank above the ground if you want to see a spectacular explosion (although this can be achieved in a number of other ways).