I'm pretty sure it's possible to b2 charge after a ground freeze. The timing is very strict, but possible (for maximizing damage purposes), such as b1,2,freeze (or 2,2,freeze) [insert correct timing here] b2 charge,f.dash,b1,2,2,1,2,slide. Makes for a nice amount of damage.
edit: This is pretty much going to work if u predict a block after a flat freeze.