I've played 3 different shaman mains over many years in different top raid guilds. I can definitely confirm that malo was super low aggro and would pull with it all the time.
Disempower was the go-to spell to chain cast if you needed to tank.
Landing a slow wasn't really much aggro, but slow resists were a different story, which is why leading with malo would save your ass.
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lol wut
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