Peter doesn't waste any time after hearing the scream before running towards it. He was already on edge, his instincts telling him danger was afoot. He arrives just after someone else— a guy with big red wings? That's... Okay, gonna ignore that for now and focus on the problem at hand.

"I'll do what I can," he promises, quickly running back out into the street and yelling for the police. He's able to flag one down after not too much time searching, and leads them back to to the alley and the dead body. Once it's clear that they'll take over from here, he takes off in the direction the wing-guy flew, leapfrogging up a street lamp to climb to the roofs of the nearby buildings. He's at a bit of a disadvantage without his web shooters or any skyscrapers, but he can still run and jump from roof to roof to try to catch up to where the action is.