Hm. Well, this has been an interesting proof of concept. See, the thing is that we're not trying to get them to leave. We're trying to organize the evacuation. So as to minimize the loss of the ol' life and limb, you see. Stands to reason we'd need to find a leader of the community.
Find such a person. A religious, community or political authority. Obtain pointers from intimidated populace. Instruct any interviewees before that point to be maximally on board with efficient evacuation. Gather them together in a public location first. Have sods guard them.
Once an authority figure is found, deploy speech (Charles' unholy demonspeech if applicable) along with previously detailed encirclement procedures.
Meanwhile, what exactly are the newbie teams doing? How much can I discern presently?
You search around, asking anyone who you've converted, so to speak, who would be a good leader. However, you can't find anyone with any real authority. Sure, a few PTA members, Home owner's association leader, priest of the local temple, all those kinds of minor leaders but no one who could motivate and lead an entire throng of people seeking safety in another dimension. Hmm, maybe if you moved further into town, found the mayor or something.
The newbie teams appear to be fucking it up. Just fucking it right up. We'll assume you can look through their cameras so consider yourself privy to all their stupid doings.
Hmm. He's in my body, so can I control the hormones/etc going into his brain? If so, try to introduce a mix that'll stabilize his mood enough that he'll be a good talking partner. Not too many endorphins, but just enough, ya know?
[2]
Hmm, you calm him down but you don't get the mix quite right and he becomes groggy and drunk.
Continue aiding Cthunkan with the speeches and asking civilians. Be the wingman. Exchange occasional high-fives.
Ask Steve if there are any easily defensible locations on the outskirts of town, like isolated warehouses or maybe an airport. Just looking for possible portal locations.
Also, before we go, tall to the people we just surrounded: "Thank you for your cooperation with this evac. I realize this must be hard for you, so say your goodbyes for now, maybe get your neighbors moving if you feel inclined. We will be in contact with you soon with the location of the portal and transportation to it."
((I say airport if they have one because of existing crowd-directing architecture, or if it's not big enough for that, then just the airstrip for shuttle landings.))
You keep the growing crowds calm and controlled, but the search for a civilian leader turns up nothing more than a particularly over righteous soccer mom and nosy neighbors.
There's no easily defensible airports on the outskirts. There's only one airport in town and it's a tiny thing, for small planes, not a full sized airport. And its in the center of town. The other team has set up shop in a parking structure not far from here. Its a big, robust concrete structure with plenty of levels for the forming of lines. Better than nothing.
You talk to the civies and get them ready to move out.