How often until a lucky break becomes more than that? We have seen Arsenal's first goal, so often dismissed as an absolute howler from the man in goal, often enough to suspect there might be something more to this than just a streak of good fortune.
After all Pierre-Emerick Aubameyang is not even the first Arsenal forward to score through an assist from the opposition goalkeeper since the restart. Eddie Nketiah had already left Alex McCarthy looking very foolish a week ago in the 2-0 win over Southampton.
Aubameyang has a track record for such goalscoring impudence as well having won all three points for Arsenal at Vicarage Road last season by blocking Ben Foster's clearance into the net. In the space of roughly 38 games getting so many goals in this fashion suggests it is more than just good fortune.
Certainly it was apparent from the outset that Arsenal were determined to put the pressure on Norwich's backline, one shorn of every centre-back bar Ben Godfrey. Aubameyang hurtled at Krul early on, forcing a nervy clearance high up the pitch.
Meanwhile Reiss Nelson's pressing was relentless, harrassing Jamal Lewis and winning possession in the Norwich final third on one occasion, driving at goal and only being denied by some excellent recovery defending from the Canaries. Even Lacazette, whose defensive work has not been as energetic or effective under Arteta as it was under Emery, won two tackles in the first half.
Lacazette may not have pressed but what he did was make it very difficult for Norwich to build from deep. Arsenal's No.9 would consistently park himself between the back four and the Canaries' defensive midfielder, usually Tom Trybull, to ensure that the central avenue towards the Gunners' half was blocked off.
It was not the front three alone. Ceballos' broad range of passing caught the eye but on 55 minutes he had recovered possession more often, five times, than any player on the pitch.
A gameplan well executed got its reward in the 32nd minute, just as it looked like Norwich might have weathered the storm. Godfrey passed the ball back to Krul and on first glance there seems to be little danger for the Canaries, the pass is hit with enough pace and it is only really Aubameyang who is hurtling towards the ball.
But then when Krul came to look up he found his options were altogether more narrow than he might expect.
His nearest option, defensive midfielder Alex Tettey who had been redeployed at centre-back, was guarded by Nelson, who had positioned himself in such a way as to also be in the way of a pass to left-back Jamal Lewis. Lacazette was between Trybull and the ball. Out wide Kieran Tierney was covering right-back Max Aarons.
Aside from going long, something which Krul has generally not favoured this season, there wasn't much available to the Norwich goalkeeper. The moment of indecision was all Aubameyang needed to hurl himself at the ball, whip it into his path and roll in his 50th Premier League goal.
This was a more team-oriented version of the one man press Nketiah had conducted for his goal six days earlier. There has been much discussion of Arsenal's pressing revolution since Arsene Wenger's departure, perhaps more talk than action.
Unai Emery attempted to redeploy Lucas Torreira as an advanced presser but the Uruguayan found it to be a hugely frustrating experience, particularly because many of those around him were not following his lead. That appears to be changing somewhat under Arteta.
Not all of his players are natural pressers and as a whole they are still not attacking opponents with the ferocity of others having attempted the 14th most 'pressures' in the Premier League. Their success rate of 26.4% places them 16th.
And of course there are few easier teams to press than Norwich, a club who are committed to playing out from the back but perhaps lack the quality in deep areas to pass their way around teams. But Arteta's urging of his side forward was audible through the television, cries of "press" and "allez" meaning that even linguistics were no excuse to not get at his opponent.
The eye test at least suggests that Arsenal are beginning the pressing side that they need to be if they are to be successful. If you need proof, look no further than the goals from Aubameyang and Nketiah.
