If I were an ATC controller watching a supposedly routine flight flaring gear up afew feet above the runway, I couldn't help yelling on the radio in order to warn the crew of the situation. "XXXX Go around !!" could be the first sentence coming into my mind. It would be a reflex and meanwhile I wouldn't think about the rules and the lawyers. Time for that later.
This is where it gets difficult.
If you were watching a take off, and you saw flames coming from an engine, you would probably tempted to shout "Stop!".