Multiple swear words in a dozen languages run through Jack's head as the dinosaur comes completely out of nowhere. The Haste definitely helps out, as Jack starts to flee with the other two, bring this to a spot where they can counterattack. They don't want to run. Jack knows from far too much experience that those things can get up some incredible speed.

Jack casts the spell on the run, a desperate attempt, but it might give them the opening to turn this from a chase into an actual fight. "Blind!"