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... Sulpicius Asper centurio praebuit, percunctanti Neroni, cur in caedam...

The verb has two forms: "percontor, percontārī, percontātus sum" or "percunctor, percunctārī, percunctātus sum." It means 1.ask particularly, to question strictly, to inquire, interrogate, investigate; 2. find out by inquiry, to ask particularly, to question strictly, to inquire, interrogate, investigate The dative present ptcp refers "to Nero, questioning (Asper)."