Night Elf Suicided.jpg

In picture, shows that Night Elf (me; Marracas ibis.a) dealt damage to myself. The problem is though, how? HOW?!

Scenario was this : Running.... running.... failing at aiming.... get stabbed and kill self. This wasn't done through a kill bind, nor did I use a HE Nade. I was just playing Night Elf and this has a tendency to happen from time to time which STILL is a complete mystery to me on how this happens. Is it thorns that is acting up somehow which is reflecting damage to user in process rather than delivering the damage?