The first group, the ones who had been ending their shift when the attack started, were rotated off the line to get some sleep, as the battle wasn't showing any signs of ending in the next few hours, but Karl's side of the line was at the point where you could call it under control.
That let them all rest a little, as they were mostly using the largest scale attacks they could at greatly reduced power to deal with the stragglers of the monster attack on their flank.
Remi had cut back the power on her spells to the point that the monsters were actually making it through, but only the Ascended Rank ones. That was low enough draw that she wouldn't burn herself out before it was time to nap, as long as she still had Thor and Lotus's help with their refreshing skills.