As you may recall, There are at least 2 instances in Jin Yong universe where slow raw power was said to surely be able to overcome fast speed.
Case 1: ROCH
金轮法王倘若以轮上威猛之力与她对攻,小龙女便即抵挡不住
Had the Golden Wheel Monk dealt with her using his fierce power, Xiaolongnu would not have been able to withstand...
Case 2: ADS
其实血刀老祖只须刀招放慢,跟他拆上十余招,汪啸风非命丧血刀之下不可,幸好血刀老祖一时没想 到
If the Lord of Blood Sabre would slow down his moves, his opponent would be dead within several exchanges. However he did not think to fight this way...
In both cases, a much much more powerful villain was competing speed with an opponent who was well-versed in speed. The powerful villains could not win this way, but it was said that if they would just slow down, they could take out their opponent quickly.
Now, I want to know, is this really logical? How does it work?