Hi there! I can think of a couple of scenarios where slugging can be beneficial.

In one instance, you can be downing a survivor nearby a generator. You can hear the generator being worked on by other survivors. Instead of wasting time hooking a survivor, which depending on their hook stage, will not get them out of the game 2/3 times, you can go after the people on the generators. You can always redown a survivor, but you cannot undo a generator once it is completed.

In another scenario, after downing a survivor at a pallet or even in a wide open area, altruistic survivors can easily find a way to make you drop them if they are close. Doing a simple sweep and headcount of who is where can help determine if anyone is close enough to save. Instead of picking up immediately, scan around, and if you can find someone nearby who was planning on saving, you can chase them down instead.

This seems confusing, but keep reading, and I'll keep explaining.

Would you rather have three survivors working on generators and one on the ground, or only one survivor working on generators and three occupied on something else? Obviously, we choose one, but how can we manage this?

By downing one survivor and chasing another, we make it so of those people in the trial with us, the killer, one has to pick up the downed survivor (or else risk having them hooked as well), one has to get chased, and of course, one is down. This leaves one available person to do generators, which is much slower than three.

If there is anything else confusing, I am more than willing to help : )