as u may notice when you look at her down your sight on any gun it goes blurry and
shakey... even if u manage to hit her no damage is done.
the trick to kill her is...
if you notice she has two puppets next to her at all times, blue and orange, shoot the
blue puppet so it falls on the floor then pick it up. then run to a distance as all the
dead bodys will try to haras you as mantis is controling them. then at a distance shoot
the puppet at mantis it will hit her then just shake the controller till she dies.

p.s i haven't played the game in a while so i think you might have to use the syringe on
yourself before you can hit her with the puppet.

sorry i entered the wrong name the boss on mgs4 is screaming mantis not psyco mantis psyco
mantis is from previous mgs games.
my bad.

you need to throw the red "Mantis" doll at her

its hard

i cannot beat she its hard she can control me