When adventure shows up at your door, invite it in for tea. As a writer having adventure showing up is a great thing and should be made as comfortable as possible. Once adventure is there the story flows from there. The longer adventure stays the longer the story will flow. However, if at any point you make adventure uncomfortable it will leave and you lose the flow. Now you have to finish the story without adventure or hope you can lure back to help you get back into flow. But don’t try to hold adventure against its will. Adventure is a lot more slippery than you think, it might knock on your front door, but it can slip through keyhole on other doors.
Once you have let adventure in, you should enjoy the tea before you get into writing. Part of this is out of politeness for your guest. This is like putting away you phone when you are having lunch with a friend. The other part is to talk with adventure. Learn as much as you can about the characters, setting, and conflict. When you think you have enough information, ask if you can get your writing supplies. Only when adventure agrees should you start writing. Then you will get the story flowing with the help of adventure. From there enjoy the trip and don’t forget your towel.