That's the unwritten rule in hip-hop. If I get on a record with you, I want to smash you. That's it. Every MC knows that. If I'm on a track with you, I want to be the best on the track. That's just how it is in hip-hop.
No theory about our bodies as mere objects of observation and calculation (as distinct from partners in communicative interaction, assumed to be free) can comprehend human nature.