It'll be easier next time!?!?

What did she mean at the end when they were riding off in the truck? One of the women say "it'll be easier next time" i mean if she meant of how efficient they were as a pack of killers/team they did feckin great! Lol or does she mean that it will be easier to kill?? Because they didn't look like they were having a hard time terrorizing/killing them to me! Can someone please explain as it's bugging the crap outta me!



"I'm always right. Even when I'm wrong, I'm right."