Mikey was still staring at the residue glow round the greenhouse, frozen, when Spencer's hissed suggestion sank in. He slipped in through the door hurriedly, shifting back so there was plenty of room for Spencer to do the same.
He peered out through the glass as he did, trying to make out whether the house elves were coming over or not. From the way they'd followed the patronuses in the corridor earlier, he guessed they'd be attracted by the sudden flash of colour. It was difficult to make out anything going on outside though. The green light had stripped him of his night vision and all he could see for the meantime was indistinct dark shapes. "Spencer?" he muttered worriedly, not yet able to turn his head from the window. "Did they see us? Are they coming?"