Well, I had read it, and I did know that. I also know that such words are as meaningless as the words "high crimes and misdemeanors" in the part of the Constitution governing impeachment. Impeachment is a political act, and is therefore subjective. So is invocation of Section 4 of the 25th Amendment. All that matters in the end is what the guys with guns, i.e. the Secret Service, in the most immediate case, will do. I believe they will follow the vote by the Cabinet and the Vice President. Even if such an action were reviewed by the Supreme Court (which would take days or weeks as you've indicated), the Supreme Court would probably defer to the judgment of the Cabinet. Being willing to use nuclear weapons indiscriminately is a rather strong indication of being so mentally unbalanced as to be "unable to discharge the power and duties ..." of the Presidency.