I'm not saying it was NOT a cheat, but I will tell: its possible under some circumstances:

- Paladin sword oath makes AA hit "twice".
- You stood right in front of him the whole fight.
- Paladin Alliance/GC got haste buff
- Paladin Alliance/GC got dps buff.
- That said buffs can stack
- You got Full Swing debuff

It happened to me once:
Monk started chasing me after getting 2x dps node buff and 1x haste node buff. Pacified me with Axe kick (and got GL3) and PEW-PEW-PEW and killed me into 6-8 secs, probably using every single oGCD.