See the problem with robot murder is that Peter's usually the one that ends up having to fix them, so when he hears the telltale sounds of robo-death while he's out doing whatever it is that he does, he stops in his tracks, rolls his eyes, and barges into the abandoned shop.

"Ooookay, can we not with the robot killing? Do you have any idea how long it takes to--" and then he promptly shuts up, because he knows this guy and oh yeah, that Athena chick said that she'd seen Adam Driver Kylo fucking Ren and wow Peter's suddenly wishing he was better at thinking before opening his mouth.

"Uh. Actually, you know what, I bet he deserved it. Keep on keepin' on, my dude." He's just going to start backing towards the door, nothing to see here.