Knockback and AI avoidance from AOE grenades is a mechanic that was exploited alongside arena layout to push Atheon and the Templar off of their respective maps. It's both a mechanic and an exploit. I guess I confused you with citing Crota cheese, I hoped it would resonate more because if the recency, but apparently it wasn't a direct enough parallel to draw.
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Well because that IS an exploit. Using your teamates orbs to refill supers is teamwork and is perfectly valid. Perhaps they didnt intend for this method, but I think its awesome and would like to see super battles :)