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Danny: Oh, just because we're Not Human we're not WORTH the effort of being saved? Are you kidding me? You call yourself heroes??!
Normally summoning an ecto entity in the DCverse isn't a problem the Justice League Dark needs to solve, there is absolutely no ambient ectoplasm in their universe, the ectoplasm they do have pools and stagnates becoming completely unusable for ectoentities. Any ectoentity summoned usually burns all their ectoplasm on the trip to the circle before literally fading once they arrive, it is unfortunate, but without energy to keep their form no ectoentities can survive the trip.
Or so they thought.
The only reason they arrived to stop this cult is because they didn't know at first what they were summoning, once they arrived and say the ghost speak runes it was pretty clear they didn't need to waste energy trying to stop the summoning. One member who didn't know about the realms or ectoplasm was worried about the circle, so they decided to calm their fears by letting them see how harmless the summoning is, let them witness for themselves.
So the circle lit up a sickly green as the entity was used as a battery to their own summoning, the circle began to ripple and bubble as it turned from concrete into a pool of glowing ectoplasm, a portal. A hand of glowing white reached through, and the rest of the being was quick to follow, one of the members witnessing who was more aware of what would occur was heartbroken to see a teenager pull themselves through.
Once the being was completely through they lost all energy and fell to the floor which had returned to concrete, but instead of fading like they expected, the kid disappeared in a flash of blinding white light.
What was left in the circle was a very much human teenager!
Maybe they were needed after all.