Happens a couple of times a week in WvW only. You’ll be fighting, usually 1v1, there’s no lag, you’re at full or close to full HP and then the other guy will just pop you with a random skill. You’re instantly taken from 15k+ HP to downed in one go.
You think, “Umm OK” and go back and check the combat log and there’s nothing, small random hits, a few hundred or a thousand or two damage and then nothing, no indication of any major hit (backstabs or killshots etc) or flurry of hits.
The latest one was a thief on Eternal Battleground using his Number 1 auto-attack on his pistol, about 12k dmg in one shot, no big skill, no CnD, nothing, just 12k from auto attack.
Really frustrating.