Use this trick to prevent Sheva from getting stuck in the cage in Chapter 6-1. When you go up the first set of stairs on the little walkway, equip a rifle with the scope enhancement (for better zoom capabilities). Look up at the crane. You will see a Manjini getting ready to pull the lever to trap Sheva in the cage and setting off the ambush. Kill it the prevent the ambush. However, if you do this trick you will not be able to access the crane area without the keycard, and thus not able to move the cage to access a gold bar worth 3,000 gold across a few containers in a safe.