For Professionals, a battle in reality and a battle in a secret dungeon were two completely different things.
The former was far more difficult than the latter.
Mainly because...
In secret dungeons, Professionals could see the system prompt.
You can see what skills you have used, how much damage you have dealt, whether you have successfully hit the enemy, what the enemy's attributes are, what the enemy's skills are, what effects the skills will have on yourselves, and other information.
While in reality….
The system would only notify you of how much HP you lost, what abnormal status you were under, and the enemy's personal level.
As for what the opponent's skills were, what equipment the opponent had, what their attributes were, how much HP your skills could reduce... It all depended on your own experience and judgment.
Sometimes, you're clearly stronger than others.