The count comes before everything
A five-versus-three does not go to the side with the lead, the better champions or the better player. It goes to the five. The only way to lose one as the five is to make a serious mistake, and the only way to win one as the three is for the five to make one. Everything about mechanics, itemisation and positioning applies after the count is even. Before that, it is noise.
That sounds obvious written down. In a game it is not, because the count is never shown. The scoreboard shows ten champions alive. The map shows the ones you can see. Nobody shows you "there are five of them within twenty seconds of this spot and two of you".
What it looks like in your footage
The coach measures the count directly from the recording. For every second it knows where each champion is on screen and on the minimap, so it can say, for the decision point of a fight: how many enemies are within a short distance, and how many allies. The numbers-disadvantage tag goes on moments where that count was lopsided before the first damage.
- All five enemies in one cluster near the player. Visible, on screen or the minimap, within a fifth of the map.
- Two or more allies far away. In side lanes, in the jungle, on the way back from base. Measured as distance across the map, not as a feeling.
- The player at full health and moving in. The health readout is high at the decision frame. This was not a fight the player was caught in; it was a fight the player joined.
Why the count gets skipped
- Allies feel present when they are alive. Nasus splitting bot lane is alive, on the scoreboard and on the map. He is not in the fight and cannot be for twenty seconds. The mind counts him anyway.
- The first enemy to show is the one that gets counted. A player sees Volibear step up and thinks about Volibear. The other four are within reach and not in the thought.
- A lead makes the count feel optional. Two kills up and a full item ahead, players fight the numbers because the numbers have not punished them yet. They will.
The one change
This is not passive play. A team that refuses the five-versus-three and takes the tower on the other side of the map wins that exchange. A team that fights it, loses the fight and then the tower and then the dragon. The count is how you decide which to do.
A drill for your next five games
Every time you see a fight starting to form, say two numbers out loud: enemies within reach, allies within reach. Do not count allies who are more than a screen away regardless of what the scoreboard says. Then act on the numbers. The habit takes about three games to feel natural and one game to notice how often the numbers are bad and you would have gone in anyway.
How the coach catches it
Leaguio Coach tags numbers disadvantage when the measured count at the decision point is lopsided and the player committed. The storyboard shows the decision frame with the enemies marked and the readout listing who was visible, then the frame where the damage starts and who was close, then the last frame alive. The two allies who were away are named in the text with their distance across the map, so the "3v5" is a measurement, not an opinion.