It’s not uncommon for me to come to a point in my story where I’m not sure how someone will react, or what will happen next. But I have a fairly simple solution, one that may even work for you.
I ask questions about the situation. I’ll write the questions down in the notebook for that story. For example: How does __ feel about x. How does __ react to x. What needs to happen before I can get to x. Sometimes the answers start to come to me as I write out the questions… sometimes I have to get away from my desk and do something else, fold laundry, load the dishwasher, lay down for 15 mins and close my eyes, take a shower are some of the more common things I do. I don’t go do these and think about the story, I go do these and clear my mind. It’s the clearing, and not focusing on what the problem is, that let’s my subconscious get to work.
How do you work through the stuck? Let me know what works for you.