First Awareness
Those used to this by now probably knew what it meant when they felt their magic return for a moment. For the rest, suddenly their powers were back. Just for a few minutes, but a lot could be done in a few minutes. If the person even noticed their powers were back, that is.
Of course those on the shore might have seen the hazy indistinct shape through the barrier coming closer, might have seen the moment the hole in the barrier opened. Might have seen King Ben leading people down a gangplank through the barrier with crates of supplies....
Unions, Re And Otherwise
Once the supplies were unloaded, the barrier was sealed up again. King Ben seemed to be in charge during the unloading, Once the barrier was closed again, by the green magic streaming from the Queen's finger, it was Mal who seemed to be in charge.
"Alright, listen up. We have 2 hours and the clock is ticking. I'm not FG but we're keeping to a deadline anyway. If you want to come to Auradon or know someone you want us to bring back, you have 2 hours to convince us. You and everyone else, sharing the same 2 hours. Along with anyone who has a supply request for our next visit, or updates. Those of you bringing supplies to the school, time to get cracking. Two hours passes faster than midnight at the ball."
Those What Remain
Once those going back to Auradon had left and the barrier was back in place, it was for those who remained on the Isle to sort the supplies and figure out how to get done everything that needed to be done with the people that remained.