Titan is not as much of a reaction fight as it is a prediction fight

In each phase he uses abilities in very distinct patterns.
Phase 1 is just tumult and landslide over and over
Phase 2, when he lands he will use Weight of the Land about 5 seconds later, then from on its Landslide -> Tumult -> Weight of the land repeating
Phase 3 he will use Landslide, then Weight of the land then i think tumult then bombs then it repeats

Once you learn these patterns it isn't a case of "Oh this stuff appeared under my feet, better run out" because that isn't going to work for you. It's a case of "Oh he just used Tumult, better use sprint or start moving early"