i'd go out on a limb and guess statute of limitations maybe. not positive what his charges/warrants were for , but it's entirely possible he had a lawyer fix it.
or, he got a bogus i.d. and passport Iceland or Finland or wherever he's been living/training/passing through. not that hard, especially if you get one expedited and show you need one THAT DAY (it's possible, i did it in 2014).