User blog comment:Kaido King of the Beasts/Chapter 863: Who's Afraid of the Big Bad Mom?/@comment-3185063-20170420211744/@comment-26058050-20170421125213

I'm guessing that Katakuri actually has to be focusing his Haki to be able to sense the future. He'll do it regularly to be on guard, but if events such as what is currently happening with all the Luffy's, he can easily be distracted, or lose focus