How do I kill the two giants I can not kill the second one.?

Unless you've dropped one of the el gigantes into the lava you can do that if not just shoot the other one as much as you can

To kill one of them you climb up the ladder to the right of where the el gigantes came out of then use the zip line to slide down to a lever, now wait for one of the el gigantes to walk over the center cicle and pull the lever to drown him in the lava, but stay away from the center because the one drowning might reach for you and pull you in the lava. Then just take the other one down like any other el gigante.

First find a ladder on the side then climb it and as soon as the giant (el gigante is it's real name) slide down the rope and press A on the lever then wait untill the giant is in the circle in the middle press the lever then you will get rid of one then I would kill the 2nd one, BEWARE don't stand too close to the middle when you send the first one in the lava

You can kill them with a rocket launcher in the face. One shot in the fce and he is dead.

An easy way is if you get one to go to the centerof the room where the circle is. On one end of the room there is a swithch (if you don't see it, you'll probably see stairs. Climb them and slide down and they'll get you to the switch), press it and the circle will open, sending him in the lava and killing the giant. Then you can shoot the other one with the rocket launcher, or another gun. It got me the first time too.

There is a lever to pull to open the lava pits. Open them up and shoot at them and make them follow you and make them fall in them.I found it easy as the first one fell before I got my gun out

Perfect Bfly. Solution to all.

Or, you could drop both of them in the same pit! Lure them over it, flash them, then open the pit. You only have a small window to do this while they are flashed.