The only light Severus could make out was the glow of his own Patronuses, off in the distance. They were mere pinpricks of silver light at the moment, but they were steadily growing, which meant that the Dementors were closing in on them, as well. It was going to be a close shave, even before he heard one of his charges stumble.
"Lumos!" he called, to ignite the tip of his wand, just in time to see Dave hopping on one foot. He couldn't walk like that for any length of time, and especially not support Miss Potter, as well. Severus bent briefly, to tap his wand against Dave's injured ankle, with a quiet, "Ferula." Instantly, bandages wrapped themselves around the boy's ankle, binding it tightly to a conjured split. Then he straightened and held his wand aloft, squinting against the light in order to locate the hotel.
"This way," he said, nodding in the correct direction. "You have her?" he added, to Dave.