Hi,
if you use headbutt with a rune that has a “on-elite use” 6th bonus such as Surging or Krait, you only get the 6th bonus if Headbutt does NOT land on an enemy target. If it lands, nothing happens aside from the skill normally unfolding. I’ve been reporting this for months. Please fix. Just so we’re clear, it has nothing to do with the rune’s ICD.