percontationes ab adverversario habitae (after Quint., 5, 7, 11, variis percontationibus, quales ab adversario haberi solent, etc.). He must be subjected to a very severe cross-examination., interrogandus est quam infestissime ac premendus (Quint.). The witness becomes confused, and his evidence is shaken by an artful cross-examination, turbatus est testis, et a patrono diversse partis induitur in laqueum (Quint. 5, 7, 11; Zumpt, but Codd. inducitur). To re-examine a witness whose evidence has been somewhat shaken by his cross-examination, testem, si quid titubavit, opportuna rursus interrogatione velut in gradum reponere (Quintilian).