How does Death Fire Touch work when hitting enemies with multiple skills?

Here is the wikia page on Death Fire Touch

  • Deathfire Touch is a spell effect and will only be applied to instances of ability damage.
  • The damage from this mastery does not trigger itself nor other spell effects.
  • Multiple instances of damage will refresh the duration but does not stack. & On DoTs the duration of the effect is: DoT's duration + 1 seconds.

Multiple instances of Deathfire Touch do not stack, and will simply refresh the duration based on the last ability hit.