Arsenal again produced a Jekyll and Hyde performance to throw away a two-goal lead at Watford on Quique Sanches Flores’ return to Vicarage Road.
The Gunners looked good value for victory at half-time, after Pierre-Emerick Aubameyang’s first-half double.
But in the second half, the away side fell apart as Flores’ men fought back.
A dismal error from Sokratis handed Tom Cleverley the chance to reduce the arrears early in the second period, and the ex-Manchester United and Everton midfielder fired home.
Then, with just under 10 minutes to go, David Luiz decided to press his self destruct button, dangling a leg and bringing down Roberto Pereyra needlessly, with the Argentine scoring from the spot.
Out on their feet, Arsenal almost lost it in injury time, only for Bernd Leno to deny Abdoulaye Doucoure following a sweeping counter-attack.
Here are five talking points from Vicarage Road…
1. Ozil and Ceballos both start in Emery’s latest switch
Against Tottenham last time out, Unai Emery opted for a 4-3-3 formation, unleashing his strike trio of Aubameyang, Nicolas Pepe and Alexandre Lacazette.
Without the Frenchman, the Spaniard made brought in both Dani Ceballos and Mesut Ozil – for his first start of the season – also dropping Joe Willock to the bench.
That brought about a tactical switch from Emery, who reverted to the 4-3-1-2 shape seen in the loss to Liverpool at Anfield.
It meant Ozil operating in his preferred No.10 position, and Ceballos operating in a deeper role.
The Real Madrid loanee worked hard and won the ball for the opening goal, but was replaced on the hour mark having had little impact on the game in the early throes of the second period.
Ozil lasted until the 70th minute, and while there were a couple of smart passes, it was one of those games where he failed to really make his mark.
2. Poacher Pierre
With Emery changing formation, it meant that Aubameyang started as part of a strike pair, in a central role, rather than coming in from the left side.
That meant he spent much more of his time operating between the width of the 18-yard box than he does when Lacazette is in the lineup, thus putting him where he is most dangerous.
And when he was found by Sead Kolasinac midway through the first period, there was never any doubt as he swivelled where the ball would be heading, Likewise, when teed up for his second.
According to Opta, that second meant Aubameyang had scored with seven of his last nine shots on target in the Premier League.
His sharpness in and around opposing penalty areas is Arsenal’s biggest strength. For the next month, during Lacazette’s injury absence, Aubameyang will remain in the No.9 position.
However, when his close pal is fit again, a familiar conundrum awaits his manager.
3. Play to the whistle, Etienne
Etienne Capoue has been largely excellent for Watford in the last 18 months or so; Abdoulaye Doucoure is often linked with the big-money move but Capoue is perhaps the biggest loss to the Hornets midfield when he’s not there.
However, he forgot the most basic rule of football on Sunday: Play to the whistle.
When Arsenal took the lead, it came after a Ceballos tackle on Will Hughes; Capoue thought it was a foul and decided to stop.
Sead Kolasinac didn’t, and duly strode forward, fed Aubameyang, who notched.
4. That defence… again!
Sokratis gives the ball away in his own penalty area, Cleverley scores.
David Luiz needlessly makes a challenge and gives away a penalty, from which Pereyra levels.
Again it is Arsenal’s defence that proves their undoing, with Emery’s two most-experienced players at fault as points were lost.
Arsenal have conceded three penalties already this term, and no-one does individual errors in their own third quite like the Gunners.
At what point do they stop playing from the back, a method Emery is wedded to, but which only enhances the trouble back there? Because this pair are anything but solid when asked to do so.
Calum Chambers and Rob Holding – when fit – must be wondering when their opportunity will come to try and make a partnership for themselves.
However, it isn’t just that pairing that is the problem. Here they conceded 31 shots on goal, a sign the team, as a whole, simply isn’t doing enough in the defensive phase of the game.
5. Deulofeu and Pereyra can lead Watford up the table
Watford are one of only two Premier League teams without a win so far this term.
But if Quique Sanchez Flores can draw the best from Roberto Pereyra and Gerard Deulofeu, then the Hornets should rise up the table in no time.
Both have talent, can create and score goals. Watford’s xG for the encounter was 2.83 – that figure was just 1.15 before Pereyra’s entrance into the game.
Other big-money signings – Ismaila Sarr – have been brought in, perhaps to replace them, but the attacking duo remain key men.