Thanks for clarifying that! I wasn't aware in such manner of those mechanics. I knew that Diablo is numbers and numbers but this overwhelms me
To the discussion: I honestly don't think Blizz should ban them or reset leaderboards. They figured out by themselves that combination of mechanics and I'm just amazed that acctually things like this are possible. For me as casual player most combos restricts to for example SoH + Lightning damage. Rly ppl It's just a game and we are wonderful community! "Are you not entertained"
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Check this Quin69 Area Damage guide. At some point he explains how mob hit box works and why you "see" more mobs that you really hit.
Also, you must know that counter for Condemn objective have cooldown so you won't spam Condemn on one pack of mobs till you complete it.
Here: https://www.youtube.com/watch?v=ydMEhQaULu4
Cheers