How do you beat screaming mantis in MGS4

When the battle starts, use the syringe. Shoot at her dolls, the blue on first. Eventually, she will control Meryll. Inject Meryll with the syringe, and continue to attack the blue doll. She will again try to control Meryll, so inject her again. Now you can knock away her blue doll. Pick it up when she drops it. She can no longer control the dead bodies. Now shoot the orange doll. Once you get it, equip it, hit Mantis with it, then shake the controller. You should win. (Note: this counts as a stamina kill)