Sam nodded and smiled at the girl. "Thanks, and sorry for being late," he told her, walking over to where everyone else was and waiting for his turn with the Boggart. What form it would take, he did not know. Probably a spider... Mmm, most likely a spider, a really big one, but then again, he did have a feeling that's not what it was going to be.
A fear of the unknown, this was what this was, and it was truly petrifying Sam, he didn't know what he was going to do, or what was going to happen, Boggarts were meant to take the shape of what we feared the most, but how could that be the unkown? All this was too much for Sam, who paled and decided to get it over with. Walking forward the boggart seemed to shift its focus, if it had such a thing, over to himself, before changing it's form instantly. It became a dark cloud, what of, it was hard to tell, but it was pitch black. Quickly it floated over to Sam and enveloped him wholly, cutting off his senses.
As he struggled to figure out what was happening to him, he came painfully aware of his lack of awareness. He didn't know where he was, or what he was doing. Finally, something appeared in his mind, and he knew what to do. "Ridikulus," he shouted, and the black "cloud" changed into a cloud of fair floss, which Sam happily took a bite of, before it left him and focused on its next target.