assignment ada: You fight Krauser as you normally would with Leon until Krauser tosses a stun grenade and dissapears.
Use the Tmp as your primary weapon against him. Then fallback to the punisher and the semi auto sniper. be careful with any grenades you have.
Seperate Ways: A weakened Krauser tries to take revenge on Ada. The battle takes place on several rooftops where Ada uses the weapons you have collected through out her story. In the end he falls to the ground. His arm withers and a puddle of blood surrounds him.
Again use your tmp but this time use your shotgun as well. These two weapons and a couple of healing items should allow you to beat him.