Demoman was nerfed so ****ing hard. I really hope they buff him back a little bit.
If this stays, it might be meta to have demo knight in 6s, or maybe sniper instead of demo.
The cool thing about this is that nobody ever expects invis watch anymore (ie quiet decloaks) so it's pretty easy to sneak up on people, delcloak right behind them, and get the stab.
Didn't she though? In Hl2 episode 2, Gman tells you during a cutscene that he "plucked" her from black mesa (in the face of opposition that she was a mere child, and of no practical use to anyone), implying that she was alive during the resonance cascade.