I just remembered one more thing that could help you. I believe it's in McKee's Story, but I've only used it on critical scenes on my scripts, not in all of them.

Consists in shaping the dialogue in terms of beats, making one sentence that a characters says an action that results in the other one's reaction (that may or may not be a dialogue), and then take that reaction and turn it into an action that results in a reaction, and so on... Action and reaction, action and reaction.

It's really helpful on the crisis and climax development of your story, and it even helps crucial turning points to be dynamic.

Hope that helps!

On Sunday at a screenwriter's meetup, the moderator played the scene Lt. Col Markinson got dressed in full uniform before putting his gun in his mouth and pulling the trigger. The sound of the gunshot blended into the thunderclap of the storm outside. That, I think was a good transition for the next scene...

Also in and of itself, it was a remarkable scene. Full of tension and  culminating into surprise.