Can I decide at any time not to fight a monster?

[Michiel]

If I would meet a level 20 platinum dragon for instance while I'm level 1, but I have enough equipment and buffs to be level 21 I could beat the dragon and so I decide to.
Now at 2.5 seconds someone screams *slow-mo low voice*NOOOOOOO! and buffs the dragon to, say, level 25.
Can I change my mind and walk away at that last moment?

I know you can choose at any time not to fight in case of the stoned gollem, but the text is different from the "will not pursue" monsters