Lines 1-4

ergo insperata deprensum luce repente

And so, caught unawares by the unexpected and sudden burst of light

inclusumque cavo saxo atque insueta rudentem

was trapped in his rocky cave and bellowing strange cries

desuper Alcides telis premit omniaque arma advocat

while the descendant of Alceus (Hercules), from above, attacked him with missiles, summoning to his aid all sorts of weapons

et ramis vastisque molaribus instat

and attacked him with huge branches and rocks the size of millstones