It's fine that the attack was blocked. Zelgius can just try again, this time with a little extra added something. He makes another swing with this blade, summoning his Persona at the same time. She strikes towards Blues with a Cleave, an attack that may or may not have much effect, given the strength towards physical attacks. The Twin Shot just barely misses Zelgius, though he's not sure whether to expect it to come closer or to continue to miss next time.