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The one I see the most is just playing dumb and pretending not to understand basic things
That may or may not be a technique.
Sometimes they’re genuinely dumb, but often it’s obvious that they know, and they know you know.
That would be sea-lioning.
Depending on what they are doing, it can be a form of sea-lioning.
https://www.brookings.edu/wp-content/uploads/2016/06/06_iran_strategy.pdf
Context?