3rd and 15+ in this situation usually warrants soft zone coverage no matter who the quarterback.
When an offense still has yet to cross midfield, there's 80 seconds left, you play to force them into 4th down.
The fact that it was Hurts, who has shown in his career that he can't sit back in the pocket and deliver into coverage, makes it worse. We had contained incredibly well all game. The fundamental playcall is to have your ends play to contain and you sot back in soft zone.
Leaving yourself vulnerable to rub routes in that situation is just bad. It's the only way they can get chunk yards.