This is what the league does. It turns every away day into a test of nerve, concentration and emotional control. Any off-field noise can become part of the contest once the crowd senses vulnerability.
For Southampton, that is the bigger warning sign than one opening-weekend loss. In this division, reputations do not buy calm afternoons. If there is a storyline hanging over a club, opponents and supporters will often lean into it.
For Watford, a result like this can do more than add three points to the table. A new-look side needs an early jolt of belief, especially at home, and beating a well-known rival in a tense atmosphere is one way to build it.
There is also a practical edge to winning early in the Championship. The schedule is relentless, momentum can form quickly, and confidence tends to change the feel of a squad faster here than in many other leagues.
The temptation will be to focus on the taunts, the temperature in the ground and the sense of grievance. The smarter response is likely to be simpler: play cleaner, manage emotions better and remove the drama from the next game.
Because that is usually how clubs quieten a story in the Championship. Not with words, but with control.
The next fixture now carries extra weight for both sides. Watford will try to turn a noisy opening into real momentum, while Southampton need the kind of performance that shifts the conversation back to football.