During a very close and tense game against a Priest, my opponent used his Holy avenger [mwcard=MWSTX1CKC06]Guardian Angel[/mwcard] to do some nasty 5-dice damage to my mage. After the attack he immediately used his Mage's quickcast action to cast [mwcard=MWSTX2FFI06]Defend[/mwcard] on the Guardian angel. After my appreciation of such a nice play, I noticed that he had also removed two of the damage markers on the Guardian angel. What followed was a discussion on whether the Defend spell should trigger the Guardian angel's heal.
The exact text on the card is "when Guardian Angel chooses the guard action, she may heal up to 2 points of damage from herself". I argued that this wording implies that the heal will only trigger if the Guardian Angel uses her own action to guard and that this heal will not trigger from having the Defend spell cast upon her. My opponent however argued that he had read that as "whenever the Guardian Angel goes on guard, heal 2 health". Whilst this rule interpretation didn't make much of a difference on the outcome of the match, it would be great to get a clarification here.