Harry/Peter
Out of the corner of his eye, Harry saw himself (actually Peter) leaping to stick on the ceiling. That almost caused him to do a double-take, but there was very little time for any of that. They were fighting, and Peter was shooting something- webbing?
Okay, now the spider thing made sense. He cast a spell, knocking one of the shadows back then finding himself backed toward his doppelganger, shaking his head. "No idea!" He hoped they weren't Death Eaters. Those guys were gone, right? Bloody hell!
"I don't know this magic-" Harry commented as the shadows came toward them- one that looked like an older woman was going straight for Parker. Harry reacted by expelling it back. And Aunt May went flying.
"So I guess that answers that question- whatever they are, they're powerful." He looked at Peter, hesitating. "Um...the...you're part spider? Really??"