The experience bomb is being explained as the result of learning something particulary useful in a fight, e.g. a new trick which you hadn't thought of before.
Could someone elaborate on what these useful tricks are? Do you just need to kill something in a different way than you had been or do you need to do something specific? If it's specific what needs to be done?
No, I don't know. Maybe it's incorporated into the game mechanics like an extraordinary dice roll : Hitting the 1 three times means something extraordinary -> experience bomb.
It's just a suggestion, merely speculation, nothing else. We've never been told how it actually works, except this archived discussion.
