Actually I think they gave chase but he evaded them in one of the incidents. In another the witness thought he was a civilian innocent bystander. I would definitely blame that guy for being dumb and for not tackling him when he realized.
BRAVO to them for "giving chase" but isn't it too bad that giving chase is ALL one can do when one lives in a country that enforces unilateral personal disarmament? Maybe armed and free Englishmen and women would have been able to do more than give chase...would he have been able to "evade" a 9mm so easily?