Not every character is who can cause a Pulse Wave effect is a hero. Nitro. Stamford incident. Killed 612 people (hence the name of Penance's special power). I'm pretty sure he couldn't see all of them when he did it.

and what has been stated many times with Stealth.
It does NOT mean that you can't see them.
If you could not see them then why are you sending someone over there with charge/HSS?
To me its more of an ability to make it where one can not shoot you rather than become not visible.