We can all react differently to so many things. I have a pump so it makes making adjustments to my basal rate easier. If I go to the dentist or any doctors visit, I drop, so for a simple visit I might boost my blood sugar a tad, or I reduce my basal starting 30-60 minutes before. But if I take a shower, the hotter or longer shower I climb, knowing this when I get out I automatically give myself extra insulin. Many people are completely opposite, hot showers they drop and doctors they climb. You don't have to drop to cause a liver dump. If your body thinks it needs fuel, it can decide to supply it. And it doesn't even have to be a need for fuel, it can be a stress response from hormones released.
The trick is always going to be to make adjustments as needed and learned. Because an awful lot of it is learned from experience. A repeated pattern and it's easier to know what you need. But we all should keep a hypo treatment handy with us at all times. You can't always count on the same response.