Old Testament style

I find Prudentius' constant referral to the "old" testament and very minimal use of the "new" testament interesting. Almost every biblical allusion that has been used has come from the old testament, with the new testament being refereed to obliquely through the mention of Christ. However, Prudentius' tweaking of the stories from the old testament to better suit his purposes is also rather intriguing. He uses Biblical figures in ways that don't necessarily make sense (i.e. the weird us of David and  Jonathan) but perhaps in doing this he adds a shading to how we as the readers are supposed to see the vices. Jonathan as an example, he only gives into vice in as much as he doesn't obey Saul, but in other ways his "vice" is seen as a good thing by the rest of the army. However, the reference to Achar is actually a fitting reference. It seems that Prudentius is just trying to keep the reader off gaurd about vice and virtue and what they mean.