So pugs reacting to whether or not the specific people you told to do something, happens to have prey is easier then 2 of the 3 people who have nothing on them at all? You are still asking people to react, you are just doing it in a bad way.
1. Specify two people to grab prey, buff them, pray to god they don't have prey and someone else has to jump in cause nobody in pugs is capable of reacting, which is why you specified people to do it but now they can't and you have to work on the fly(fuck it, it's over, just wipe). Also pray they don't get purple and if they did your healers buffed them properly. Pray NOBODY died to swift, cause then shit is getting fucked up.
2. Have 2 of the 3 people who have literally nothing else hitting them in this set, run and pick up prey off the two people, hell two people can run to one side to pick it up cause they still won't die. Pray 2 of the 3 people do this properly. Don't even have to worry about shielding them or anyone.
None of this is gonna matter in a month anyways, when everyone is over geared and has 15k hp and can eat everything on any job.