You have to be fast with this mission, but it is very easy to do after you see where everything is, so start the level to see where the traps are and then restart mission. When you start the mission, grab the bomb and deploy it on the left wall towards the middle section, so you get the explosive that looks like a pipe. When you get it, aim to the right and shoot when both enemies seem to be lined up. You will kill both of them and then grab the bomb in there. Throw the bomb at either guy in the next section. Finally, pick up the spring trap and kill the last enemy.