Not sure if this has been posted, and doesn't really concern the FGC, but a gltich all the same.
It's Hawkgirl's final Star Lab Mission. Lex is meant to charge up lasers after you inflict a certain amount of damage, and you then have to inflict more damage to him while he's charging them, or you'll get blasted and lose a whole health bar. Problem is, sometimes he'll block your attacks, cancelling the charging of his laser. The bar that indicates how long is left to charge is frozen, and on top of that, his armor remains until you can drop the red bar down to zero, which can be difficult cause you can't combo him and he doesn't have any stun from your attacks. It's okay as you can pretty much MBF3/B3 his armor away, but one of the Mission Extras is to not use any meter. It's final boss material lol