Honestly that hasn’t become much of a problem yet. When I know there’s going to be combat I’m pretty good at prepping in advance but the rp and other stuff I tend to just make up on the fly.

It’s also how I ended up with two NPCs named Phil…

Oh easy, just draw what the players see and let them discover the rest as they go.

Then throw the right player a trigger line and you have half an hour to draw the next 5 lines.

I’m sorry that the shambling wreckage of the rest of my life negatively impacted the thing I put together for your amusement.

Like, 30 seconds? Throw a dhohanoid into a big cave with a barrier that causes fear. Have a group of shovelheads encroach on the party’s territory.