I noticed that in the vaults barons picked up the power cells in the left vault. But I'm thinking knives are no longer useful as bait. I've found that at least armour, medikits and phase devices work. Sergeants were suckers for useless >50% green armours in my few attempts at AoB.
What's your experience in the new version, and what do you use for hell knights and barons? It's not really safe to give medikits and phase devices to them as you can't one-shot them like the humans, B's end up using them.