Both of you descend at the same rate and hit the water together. Even though it has nothing preventing it from turning, the giant door to the local museum is surprisingly hard to open. You're inside the museum, trying to open the door so you can leave. As you push on the door handle, the door begins to open. It turns more and more quickly as time passes.
Torques cause angular accelerations.
Since a door is a rotating object, you cause it to begin turning by exerting a torque on it. If you try to open the door by pushing on the hinged side of the door, it won't open. Without any lever arm between the pivot and the force, the torque you create is zero. That is why it is so much more effective to push or pull on a doorknob that is as far as possible from the hinged edge of the door. If you stop pushing on the door after is has begun to turn, it will continue turning until it crashes into the outside wall of the museum.