Is this intended for Pyke?
So I remember playing against Pyke and taking ignite.
When you ignite him, you get vision of the target(it that the same as True Sight, right? ), but instead of dying he went invisible(with W) after getting far away and survived with his regen and I am certain the ignite didn't wear off.
At least certain the damage was enough to kill him without any form of healing/regen involved.
. Since her Stealth requires her to be out of combat, and Ignite is in combat, she won't stealth until it's over.