The lesson kicked off with the most dangerous four words a teacher can say: "this reaction is very simple." Said with total confidence, the kind that's supposed to reassure you. It did not reassure anyone.
Because what followed was the entire remaining forty minutes of class dedicated to explaining this "simple" reaction. Not once. Three separate times, three different approaches. First the normal way. Then, when the blank faces persisted, a second angle. Then a third, with diagrams, as a last resort.
The logic didn't hold and everyone in that room quietly knew it. If it were genuinely as simple as promised, one explanation would've done the job. We wouldn't have needed the encore, let alone the second encore. The three-explanation marathon was itself the proof that "simple" was doing a lot of heavy lifting.
Not a single student said this out loud, obviously. You don't correct a teacher mid-struggle. We just sat there, nodding through explanation number three, silently holding the contradiction none of us were brave enough to name.