unity of a horse and its rider

world

pursue

pursuit, search

equestrianism, equestrian skills, horsemanship

horse and rider / centaur

on earth, the heck, in the world (used for emphasis and to express incredulity)

whole / entirety / unity

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend

distal demonstrative, something far off removed from both speaker and listener: that, yon / particularly, male personal third person pronoun: he / by extension from he: boyfriend