Harry watched how long he could hold it, walking over to him as he crouched on the floor, putting a hand on his shoulder. "How are you feeling?" he asked softly. "Can you go on? Do you need to rest?"
He waited for Al to be in a good enough position to stand up, pushing out a chair for him to sit on and one for himself. "What did you sense just before the bubble went up?" he asked. "What triggered it?" If he could find a trigger then perhaps Al could learn to use it.