AW suspicious behaviour

Just saw a player with 3 unranked 6* champs clear nodes instantly with no health loss, with active linked nodes. It's so frustrating. How easy is it to break the code?
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No one can do anything without proof.
Also, their BG1 can't even finish the second stage with R5 5*...
And we had to potion up because of this, and I am sure there will be no compensation...