Get the torque bow and the regular rifle w/ chainsaw.
Use the torque bow to scare away the Kryll from RAAM, and when they leave RAAM, load a clip into him with the rifle. When he comes for you (I stayed at the first bricks for a long time), jump over the block, do a roadie run to the block adjacent from it on the other side of the lights.
Do the same strategy (If you have more torque ammo still). If not, try grenades. But I got him with 1 torque shot left and loading into him with the rifle.