Connector from upper B
The easiest way to get into position is to hug the wall, look into the wall but facing a little bit to the left and then moving to the right.
You'll get stuck in the corner and can aim at the railing.
Release the nade right after you start running forward.
setpos -1159.989136 -1048.031250 -95.968750; setang -14.769571 5.120806 0.00