Narvuntien wrote: »Seems like a bug unless they had previously cast a spell that gave your health a boost that had just wore off at the same time. You can report bugs in game.
Couldve been a Warden using an ability that gives Minor Toughness; which then expires. Warden healing abilities are green-ish so they look similar to the teal and green of Necromancer and Arcanist.