Traps

Traps are a staple of dungeons. You can run them how you want but the method they’re set up with is using prompts. If you’re going to use this method, tell your players ahead of time and explain it to them so, when it happens, they’ll have an idea about what’s going on.
Traps will look something like this:

If a character trips the Trigger, you will give them the Prompt and the player responds with what their character would do.