You are playing a light engineer. You have a Kross SMG and a pistol. You have 1 mine. After setting up a turret, you go around a corner, and come face to face with the enemy. Their group is composed of 2 heavy's and a medium. One heavy is a soldier, the other is an engineer, and the medium is a medic. You have 1 grenade, but the enemy's are about 10 feet away from each other. They haven't noticed you yet, and you are only 20 feet away. There are some boxes around that could offer light cover.
So, what do you do?
Edited to be more specific.
