its not armor, its about cloak..and if u shoot in cloak your energy will be 0!
Read what posted, it's just the parallel for calling people cheaters. If you have Energy Transfer 3 + Stealth 3 + Mobility 3, you get full energy back after each kill. So it may very well look that someone was cloaked non stop.
If you see a guy who is cloaked and shooting non stop, yes, it's a hack but keep in mind, people with Maxed out upgrades will eat people who are still on low levels for breakfast. And yes, for new players it may seem that someone was cheating.
Don't just jump to a conclusion.

Idiot... read what he said.
the guy was cloaked WHILE shooting...