*She has no choice but to break her focus lest she get charged down... and that is no good. Now that she's free to react, she takes into consideration her physical frailness and makes a tactical decision that, although won't prevent any sort of damage, will hopefully try to minimize it.*
Damn you guys and your huge swords! Hmm... Seraph, Megidolaon!
*Seraph points, not directly at Raidou, but in fact a short distance in front of Alice. She'd get caught in the outer reaches of the blast as a result but this should hopefully prevent Raidou from connecting, or at least punish him if he tries to, his attack.*