Unai Emery has brought new life to Arsenal.

The Gunners are undefeated in their last 19 matches.

Multiple performances have had supporters singing, “We’ve got our Arsenal back.”

There are many reasons that have led to the revival at the Emirates, and the 4-2 victory in the North London Derby showcased all of them.

2Never quitting

LONDON, ENGLAND - DECEMBER 02: Alexandre Lacazette of Arsenal celebrates with teammates after scoring his team's third goal during the Premier League match between Arsenal FC and Tottenham Hotspur at Emirates Stadium on December 1, 2018 in London, United Kingdom. (Photo by Shaun Botterill/Getty Images)
LONDON, ENGLAND – DECEMBER 02: Alexandre Lacazette of Arsenal celebrates with teammates after scoring his team’s third goal during the Premier League match between Arsenal FC and Tottenham Hotspur at Emirates Stadium on December 1, 2018 in London, United Kingdom. (Photo by Shaun Botterill/Getty Images)

Arsenal falling behind and absolutely capitulating had become an all-too-common occurrence in the last days under Arsene Wenger.

No more is that the case.

This was first seen in the eventual defeat to Chelsea after the team came roaring back and really deserved a result in a fantastic game.

On Sunday, Arsenal’s newfound determination to not be defeated produced its best moment yet.

Down 1-2 at halftime due to a ludicrous penalty decision from the infamous Mike Dean, Arsenal looked very much like crumbling. But the second half was all red—just like North London.

Arsenal scored three unanswered goals in the second half to finish the match 4-2. A result like that was unthinkable seven months ago.

A fair criticism of Emery is that Arsenal would not have to be in these positions if the team started better.

Hopefully, the first halves will improve with time as the manager gets to know the Premier League better.

For now, these second-half comebacks are exceptionally entertaining and a breath of fresh air for fans who have seen the team collapse after falling behind far too many times.

A lot of this is down to intangibles like the next point…