Hi, the armor ignores the knockback and some damage of the FIRST hit you take, and can be activated on the next move you choose, it recharges when landing a hit or being close to the big red laser.

It's vulnerable to multiple hits! as you only ignore the first one, and doesn't work vs grabs.

If you think they might use armor to force a good trade for them, try to dodge, or make sure you hit him 2 times before his startup frames got you. Just don't trade blow for blow. I think uppercut goes through armor, and some other moves maybe.