If you never saw the old tracking freeze, players could select a card from tracking before it was ready to be selected. The result is that the three cards would stay on screen, the player who tried to pick a card cannot pick one, and the timer is stalled, so the turn gains an unlimited time limit. Both players can still emote and play with the board, but neither can do anything to progress the game state. The tracking bug could be invoked deliberately with good timing when one was in a losing position.
Other ways pop up to cause the state. Pandas used to do it. (shadowstep did it less for some reason, probably animation time?). I don't know how the Warrior managed to cause it, but the animation made it look like he was about to play two cards at the same time for a moment.