"Wouldn't be much of a barrier if it couldn't block a little spell like that," Rita says with a shrug, then adds, a little more amicably, "Looks like you got the basics down." He managed not to panic and accidentally cancel the spell in the face of a sudden attack, anyway.

"Feel like testing its limits? Knowing what your barrier can and can't handle could save your life." And it would be an excuse for Rita to throw some more fireballs at him, which is her idea of a fun time.