Despite his claims of being a noncombatant, Cid does clearly have some amount of combat training. Though he doesn't normally use a shield, he moves like how one would expect, automatically and without thinking about it.

Though the shield is a completely ordinary shield in every way, it doesn't seem like it's fragile enough that a single spell is enough to affect it.

Maaybe a slight scuff on it if you squint, but so far so good! "You weren't kidding about your skill," he says. He's seen Himeka in battle; he knows just how powerful magic is, but actually seeing it is still something he doesn't think he'll ever get completely used to.