The argument from miracle asks whether an extraordinary sign is so related to a claim of prophethood that it serves as divine confirmation. The context of the claim and sign is therefore essential.
An unrelated unusual occurrence, or a spectacular act with no prophetic claim, does not automatically bear the distinctive evidential role of a miracle. Truthfulness of a claimant and occurrence of a surprising event are separate propositions requiring a justified connection.
A sound argument must establish that connection before inferring the truth of the claimed commission.