Despite struggling for large periods of the second half, the away side found a lifeline through Havertz against his former employers. The German attacker stepped up to confidently convert a late penalty won by substitute Noni Madueke, ensuring everything is left to play for when the teams meet again in north London next week.
The manager was delighted with the forward's composure on a special night. "Yes, how composed he took and yes, football is a funny game and it brings special stories and him coming back here after such a long time, being part of this club, to come here and score such an important goal, I think it's a big moment," Arteta noted, before adding: "I liked that emotionally, we understood what we had to do."