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Question: what exactly is a “Basic Attack”?

Is it simply any non-special attack? Does it include heavy attacks?
I ask because I see “Basic Attack” listed in at least one node, Mix Master.
I ask because I see “Basic Attack” listed in at least one node, Mix Master.
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Comments
If you are concern about Mix Master, the usual tactics is to parry then LMLM.
Otherwise, you can also use can champs with True Strike/Slow to bypass the Evade.
Against mix master they only evade if you repeat the same basic attack twice. Dashing back or blocking doesn’t count and doesn’t trigger the evade.
Might you be thinking about tunnel vision ?
Where the same “action” results in the falter debuff?
So mix master causes evades when you do one of those actions twice in a row.
As for the comment @Jaded made, that interaction only works on nodes like tunnel vision, which is done by an action and not a basic attack, so dash backs and blocks count, as @Onmix said
Is it because his heavy is two hits? Maybe just a bug?