It would've been so easy to .... (spoilers)
ESCAPE
Get in the car and drive. That's all there would've been to it.
Why would you stop for a fragile old cultist cop?!
Also, isn't it kinda funny the only contact the guy knows is a taxi number? I mean, he's fearing for his life and he gives up after the taxi won't service him. Would make sense to call a friend, or his parents, or anyone.