I've noticed that I've been getting killed by plasma launchers after I activate armor lock. What's the deal? Did 343 update this or do I have to activate it sooner or what?
It's a title update change - if you get stuck with a plasma shot or plasma 'nade and go into armor lock, you still die. No get out of jail free card. However, non-TU playlists still exist and still work the old, regrettable way. Team Slayer, for instance.
It happens with plasma grenades too? 'Cause I've popped into armor lock with one on and it didn't affect me. My understanding was that as you take damage in armor lock, it's depleted faster.
Again, depends on the playlist. Any playlist with the TU applied, it should kill you. That's true of things that hit you after you lock. But if you get stuck before you activate the lock, it's supposed to kill you now.