I keep trying to do that one with my brother, we've done all the others on veteran but this one. I saw a video that said to keep running around so you don't get cornered. I always put like 10 claymores in one spot so they die if they go there, set the explosive barrels to blow with c4 and put the rest of the c4 in one spot, As you run, you lure them into your traps. A head shot with the thumper kills in one shot if it blows up, so you can't be too close to them.
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