He's doing both, which is ideal. The fact that he HASN'T been running all night is what gave him the space there. The Titans weren't sure if he was going to pass, kick or run. If he'd been running all night, they'd have gone right for the tackle.
I'm not against him running at all haha. I just appreciate it when his kicking game is on point. It's desperately needed for us to win these sorts of games.