Odion Ighalo came close to leaving the Hornets, according to his boss.
The Nigeria international's first-half double condemned the Magpies to a 2-1 home defeat and an even longer wait for their first Barclays Premier League win of the season.
But after the Hornets had picked up their second successive win, Ighalo's manager was thrilled at not only his efforts, both those of his entire team.
Flores explained: "He took a decision two months ago to stay here at Watford - he had offers from other teams.
"He decided to stay here with us, so it's clever because he saw something in the football that is good for him.
"He is involved a lot with the team in training during the week, so for us, he is a very important player.
"But I like to talk about the full squad because they are fighting like heroes every single week, they are playing really, really well. They try to improve every time and give the best they have, so it's not only one man.
"It was nice for Ighalo, but it was a very good performance from the whole squad."