Remember that landslide is going by the cast bar and not the animation and the animation plays for a little longer than it should. This means you can pretty much run into a landslide to avoid getting hit by a bomb explosion if you time it right. You won't get knocked back or won't take any damage. Also, for EX mode, there is a small delay between Titan smashing his fist on the ground for Landslide and the moment the bombs explode when compared to Hard Mode. So don't go running to the middle of the arena during row bombs the moment Titan smashes his fists down, lol.