How do you beat screaming mantis in Metal Gear Solid 4?

Answer 1

From gamefaqs.com:

6. Screaming Mantis

====================================================

Recommended Weaponry (Lethal/Non-Lethal) - Assault Rifle, Mantis Doll (to

win)

This fight is extremely nostalgic to Psycho Mantis, and you will soon

find out why. You must protect yourself, as well as Meryl's own life

from Mantis' control.

Begin the fight by immediately injecting yourself with the syringe,

the actual fight will begin once you do that. If you look carefully,

you will notice two dolls to the left and right of Mantis. A Psycho

Mantis doll and a The Sorrow doll. You must shoot these, not Mantis

herself. Be careful of the floating FROG corpses, they can shoot you

or stab you if you get too close. Once you shoot either doll a few

times, Mantis will begin to manipulate Meryl more and have her attack

you.

Take cover behind one of the pillars at the top of the stairs, and

Meryl will leap over to you. Grab her using a CQC attack (remember

only handguns, knives or unarmed for a grab), make sure the syringe

is equipped, and then press the action button when she is grabbed to

inject her with the syringe. Basically this is the exact same thing

you did to Vamp. It will instantly knock her out.

Once Meryl is knocked out, continue to fire on Mantis' dolls. After

another few more hits, Mantis will raise Meryl once again, and put

the gun to her head this time. Quickly go down to the center of the

battlefield and grab Meryl in another CQC hold and inject her again

with the syringe. The FROGS corpses will most likely be near you and

will attempt to stop you. Keep trying to hit her with the syringe if

they land a hit on you.

Once you deal with Meryl again, you will finally be able to kill

Mantis freely. Continue to work on whatever doll you were shooting at

the time, you will notice it gradually fall from her side. After

about 10 hits or so it will fall from her side and fall to the ground

nearby. Quickly run to where the doll fell and pick it up before she

does herself.

Repeat this for the second doll. Be careful of her warping and slash

attack, she will scream "SNAAAAAKE" before she warps to you, giving

you plenty of time to run away. Once the second doll falls, you can

now kill Mantis. Equip the Mantis doll and fire off the projectile at her.

If it lands, you will be able to string her up like she did to the others.

Hold L1 and keep moving the Sixaxis back and forth between you and the screen,

this will shake her and inflict damage to her. You can kill her in one go

with this, quickly ending the fight. Note that both her stamina and health

gauge will deplete together.

*To end this fight quickly you only need to bring down the Mantis doll and

use it against her. The Sorrow doll is not needed to win, however if it is

your first time playing shoot both dolls so you can acquire both for future

playthroughs.

You know the drill now, either tranq or lethal kill Screaming Beauty

to win.