Armstrong's strike was sandwiched between goals from Ché Adams and Nathan Redmond to seal all three points, lifting Saints into third position in the league - temporarily at least.
The Scot recanted how Saints' recent success had been centred around their pressing game, but how the team are also now growing in confidence with the ball, as evidenced by today's trio of well-worked goals.
"We work on pressing a lot but we've also slowly been introducing the possession side to our game," Armstrong commented. "Today was a perfect example of that; a high press but also a calmness and composure with the ball. We created a lot of chances despite them sitting back.
"It's been a while without fans and we've had some really bright performances so it's been a shame they've not been here to see them.
"Today was, first and foremost, about getting a good result but to top that off with a performance like that was a nice thing for the fans to see and great for the whole team."
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