Thistle's players were left apoplectic at Ibrox when Rangers player Malik Tillman put his side 2-1 ahead in dubious circumstances deemed unsportsmanlike.
Shortly before, Tillman had gone down injured and Rangers kicked the ball out of play to allow him to be treated.
On the restart in the 71st minute Partick appeared to be set to sportingly give back the ball to their opponents by passing an uncontested ball towards the Rangers defence but before they could do that Tillman, showing no sign of injury, nipped in to gain possession and advance forward and score.
After a melee involving virtually every player on the pitch, the game restarted with Rangers, after instructions from their manager Michael Beale, then allowing Thistle's Scott Tiffoney to go through unopposed to make it 2-2.
Rangers eventually snatched the win late on when James Sands' header crossed the line.
