I can excuse having the archer pull. The arrow is silent, and orcs yell all the time, so no one notices anything when Grok’thar bellows and goes rushing down the hallway. He’s just like that. The same for when you bean an ogre: he may have been knocked silly, but shuffling about and drooling is normal for him. I can even buy the sniper rifle pull, because I assume a silencer.
My Sonic Defender pulls by screaming. Literally. Her attacks are Scream, Howl, and Shout. The guy five feet away does not notice anything. Once I got Screech, I could stun someone in the middle of a group, scream him to “arrest,” and then start on his friends before they notice. Let’s suspend disbelief a little further: you can focus sound waves similar to the way lasers focus light, so maybe someone nearby would hear nothing from a well-focused sonic attack.
What about the guy with the fireballs? When my Ice Blaster chucks a head-sized block of jagged ice at your friend, do you not even notice its hitting the ground? What if I pull a torso-sized chunk of concrete from the ground and knock someone across the room? “Bob’s running off down that hallway again for no good reason. Grok’thar, did you leave this concrete here?” Does anyone see the pitched battle with grenades and flamethrowers on the other side of the room?
At least my Psychic Blasts make sense for that. Only how does he know where to run when someone punches him in the brain? Maybe only the target can see the psychic bolt coming. City of Heroes has properly recognized that psychic power manifests itself in glowing pinkness.