User blog comment:Plexioth- xD/Monster Hunter 3 Ultimate/@comment-28303251-20120330171751/@comment-28303251-20120331195543

Yeah that's just because monsters like Jho in Tri or Bracchi in 3G have their own themes, so it makes sense that their music will take over if they spot you. :p

For the limping part, sometimes when the monster is trying to escape, they may end up "forgetting" about you...so thheir music ends.