Re: Snakes and rats and smoke, oh my!
Harry had been sneaking about under his cloak, though he didn't intend to use it the whole time. Mostly because one of the teams was stacked with his closest friends, and they'd know all his tricks. He was going to have to think outside the box if he didn't want them to guess his every move.
After taking in some recon, he looked around for the other members of his team and spotted Lavender and Hyperion at the top of the stairs, facing down...well, Harry wasn't sure what they were but he didn't like the look of them. They seemed confused though, and he could use that to his advantage.
He crept up the stairs, then cast de-animation charms on the sentinels. They froze, returning to their lifeless natural state. He swept off the robe and shoved it in his pocket, grinning at the other two. "All right, Ron's team is planning something--probably to do with me, but I couldn't get a read on the other team. I can act as decoy, while you two go after the flags."