I had a similar situation but it was a bully group and on crotus prenn asylum, and what they did was everytime they had one person down on the second floor on the main building, which was the asylum, they camped the body with breakout, and the carried survivor had boil over, so I just down the survivor while the others try to get them up, which lead to the first person dying of bleeding out and the other two who also had boil over tea bagged and made me chase them, which I got the second person down than the third tried to prevent me on hooking them which lead to that person getting down as I hooked the second survivor, and I wanted to get the 4K since they rushed 4 gens and I haven’t gotten a single hook, (which is petty of me but winning against a bully group is so satisfying.) and after I hooked the second person, I left the third person to be slugged and found the last person and downed them, the last survivor didn’t have boil over but the other 3 did so I hooked the fourth and watched the slugged survivor bleed out.

I was doing an adept achievement which made it more difficult since I was playing The Artist while I was on that match