poenae . . . est, ‘is rapt in the thought of vengeance.’ Cf. Fast.VI. 251, “in prece totus eram”, Hor. Epp.I. i. 11, “omnis in hoc sum”, and for similar uses of adjectives, Sall. Jug.96, “in operibus, in agmine, atque ad vigilias multus adesse”, Eun.II. i. 10, “memini, tametsi nullus moneas”, Cic. ad Att. XI. xxiv. 4, Philotimus...nullus venit.
547. The simile is from Homer, Il.XVIII. 318: “ὥστε λὶς ἠϋγένειος ᾧ ῥά θ᾽ ὑπὸ σκύμνους ἐλαφηβόλος ἁρπάσῃ ἀνὴρ ὕλης ἐκ πυκινῆς ˙ ὁ δέ τ᾽ ἄχνυται ὕστερος ἐλθών, πολλὰ δέ τ᾽ ἄγκἐ ἐπῆλθε μετ᾽ ἀνέρος ἴχνἰ ἐρευνῶν, εἴ ποθεν ἐξεύροι ˙ μάλα γὰρ δριμὺς χόλος αἱρεῖ.”