Carlos Carvalhal insisted his Swansea side would have been given a penalty and Mohamed Diame a red card within "10 seconds" if a video assistant referee had been in use at Newcastle.
The Premier League's bottom club emerged from their trip to St James' Park with a point, but were aggrieved not to have left with all three having seen Diame block Mike van der Hoorn's goal-bound effort with his arm before the break.
Joselu of Newcastle United celebrates after he scores Photo: Getty
"I can't say that is a penalty because of the place I was," said Carvalhal. "I must be honest, I didn't see it - I said to the referee I didn't see it - but with the technology that we have at the moment, after one minute my assistant said it was a clear penalty and a red card.
"I am absolutely sure that would have been a red card and a penalty, absolutely sure. In 10 seconds, the video referee would give a communication saying, 'Stop, penalty and red card', I am absolutely sure."
Swansea had survived something of a mauling up until that point with the Magpies failing to make the most of a series of promising opportunities, and it was the visitors who took the lead with 61 minutes gone when Jordan Ayew headed past keeper Karl Darlow at the second time of asking.
However, the lead lasted just seven minutes before Joselu fired the home side level, sparking a late flurry during which Swans substitute Wilfried Bony saw a shot hacked off the line by defender DeAndre Yedlin.
Jordan Ayew of Swansea City scores the opening goal Photo: Getty
Magpies boss Rafael Benitez also assessed an eventful 90 minutes with mixed emotions, bemoaning his side's profligacy in front of goal but praising their "intensity" as their run without a home league win stretched to seven games.