axe kick bug

While I was testing smear mud on the assassin mob I noticed two vastly different affects from axe kick. Both times I received the same message but see below quite a varying strength affect when dex stays the same. Is it strength supposed to be variable or it this a bug or should there be a different message if it does more strength loss? FIRST ONE Narram brings the heel of his foot down hard on your shoulder blade! You hear bones crack as Narram's axe kick lands heavily on you! Narram's axe kick MANGLES you! Skill: 'axe kick' modifies dexterity by -9 for 11 hours. Skill: 'axe kick' modifies strength by -4 for 11 hours. SECOND ONE Narram brings the heel of his foot down hard on your shoulder blade! You hear bones crack as Narram's axe kick lands heavily on you! Narram's axe kick *** DEMOLISHES *** you! Skill: 'axe kick' modifies dexterity by -10 for 12 hours. Skill: 'axe kick' modifies strength by -9 for 12 hours.