Saved to Thunderwings w/o attacking

Hey there,

I was just now, a few mins ago standing at teleport next to Thunderwings, waiting for him to spawn. Got a phone call, and forgot about the whole boss. After i was done in the phone, i come back to the pc, and suddenly i have killed the boss. While i stood at the teleport, didnt move, didnt do anything. No loot was made, no dmg was done to the boss, just standing still.

Why on earth did i get saved to a boss i didnt attack?
Didnt get any loot or anything. Just a mail with 72g…

Would like some help!