Fantasy Westward Journey law of the burst rate with the number of seconds increased?

Magic explosion probability is the probability of each unit of your seconds, for example, 3% of the mana explosion, seconds 7, these 7 seconds of the target are 3% likely to be mana explosion. When you second 7, the probability of one mana explosion is 3% X 7, that is 21%, to appear all 7 probability of being mana explosion, that is 7 3% multiplied, the odds are negligible. This and the probability of high God is the same, a battle God once is 20%, God twice is 20% X 20%