Below 4 · Everything works
Check the facts, opposite action, problem-solving, talking it through. Full range available. This is also where practice should happen, because a skill is only reachable at high intensity if it was rehearsed low.
There is a line past which reasoning is not available. Not difficult — absent. Almost every skill people are taught requires thinking, which is why so many of them appear to fail at exactly the moment they were most needed. They did not fail. They were used past the line.

It is not instant, though it is described that way. There is a sequence, and every stage before the peak has something available that the peak does not.
Not the trigger. The conditions: poor sleep, no food, an unresolved thing from yesterday, a week of small dismissals. Almost every flood has a pre-load, and the pre-load is the most modifiable part of the whole sequence.
Heat, chest tightening, a change in hearing, hands. It arrives before you know what the emotion is, and it is consistent enough per person to be a reliable alarm. Chapter 9 of the book is built entirely on this window.
Frequently small and frequently interpersonal — a tone, a delay, a look. The size of the trigger is a poor predictor of what follows, which is why explanations that focus on it never satisfy anyone.
Intensity rising fast. Thinking is still possible and getting narrower. This is the last stage where a decision can be made, and 'I need ten minutes' is the only decision worth making in it.
Reasoning is gone. Perspective is gone. Everything is now, everything is permanent, and everything anyone says is heard as opposition. Only physiological interventions do anything here — temperature, intense movement, breathing with a long exhale.
Left alone, intensity falls substantially within twenty to thirty minutes. Every action taken at the peak restarts the clock, which is why doing nothing is frequently the highest-skill option available.
Exhaustion, then shame. This stage does more long-term damage than the flood, and it is the one nobody plans for. What is needed here is repair and rest, not a review of your character.
Matching the tool to the intensity is the single largest determinant of whether skills work for you. Most people are taught the tools and not the thresholds.
Check the facts, opposite action, problem-solving, talking it through. Full range available. This is also where practice should happen, because a skill is only reachable at high intensity if it was rehearsed low.
Naming the emotion, self-soothing, grounding, a short exit. Anything with steps starts to slip. Complexity is the first thing to go, well before language does.
Cold water, intense movement, paced breathing with a long exhale, pressure. Nothing requiring analysis. If someone hands you a worksheet here it will not be completed and you will conclude you are bad at this.
No skill, no conversation, no decisions. Stay safe, stay in one place, wait. If safety is genuinely in question, that is a crisis-line call, not a technique — the crisis page lists services that answer immediately.
Nothing gets invented at level 8. What is available then is what was written down at level 2 and rehearsed enough to be automatic. Fill this in on a calm day.
The physical signals that reliably precede it for you. Specific — 'ears feel full', 'jaw', 'hands cold'. This is your alarm and it is personal; a generic list will not fire.
The exact words you will say. 'I'm past where I can talk. I'll come back in twenty minutes.' Written down, because sentences are not composable at the climb stage.
One you can do anywhere, one that needs a room. Cold water and press-ups. A cold drink and a fast walk. Two, so a missing bathroom is not the end of the plan.
Who you will contact, and what you will send. 'Bad one, don't need advice, just tell me about your day.' Deciding this in advance removes the hardest part, which is composing a request while flooded.
Food, sleep, and one small repair if something needs repairing. Written down, because the aftermath is where the shame spiral starts and a plan is what interrupts it.
Mostly about why skills stop working, which is the thing that makes people give up.
Because most skills require the part of you that is offline at that intensity. It is not a discipline failure. Learn two or three purely physical interventions specifically for above the line, and the problem largely resolves.
Rate intensity out of ten a few times a day for two weeks and note which skills worked at which number. Your line will be obvious within a fortnight, and it will not move much afterwards.
They overlap and they are not identical. Panic is typically fear-specific with a strong physiological signature and a fairly quick peak. Flooding can be any emotion and tends to last longer. Both respond to the same first move, which is changing your physiology.
Rarely once past the line, and reliably before it. Which is why almost all the useful work is in the sixty seconds of physical warning rather than in the flood itself.
The intensity tends to stay; the frequency drops and the recovery shortens. Most people describe improvement as fewer and shorter rather than milder, and that is a real and substantial change even though it is not the one they were hoping for.
Stay, stay calm, say very little, and do not attempt to resolve the content. Presence regulates and argument does not. Afterwards, mention what happened once and do not relitigate it.