"Here? I don't know. I'm not a summoner. Though I expect any fortification against magical harm would work, whether it be a defensive enchantment, on up to an antimagic field." He pauses, looking down at the... boy? girl?... does it matter? Child.
"More effective methods exist, but they're either extraordinarily complicated and thus, not applicable in the context of self-defense, or else, as far as I'm aware, unique. And you are?"