This one is hard, you need to either kill extremely fast or dodge them altogether. The Grenade Launcher may be a little tricky but it should be worth the time to pick one up. Run semi-sideways (NOT sideways! In between running straight and running sideways!), as it is the fastest way to run (whoever wrote this has completely no idea what they are talking about, you only run quicker if you use Preset B then speedstrafe). Overall, you have to kill quick and run quick.