On the Manhattan bridge, Cianfrance gave each actor separate directions.  To Michelle, he said, “whatever you do, don’t tell Ryan what’s on your mind; [to Ryan] Michelle has a secret and you have to get it out of her.”

An hour later, Cianfrance remembers “my producers are freaking out because we’re wasting film. And Michelle is hard as nails, she’s not going to give it up to him, and Ryan gets so desperate and frustrated that he climbs up on the fence of the Manhattan Bridge. There’s no stunt double, there’s no safety net, we have no insurance for that kind of thing, and, thankfully, Michelle tells him and he comes down.”

(Source : bittersweet--dream)