There are four seals that look similar to the seals that were on the Elevator, located throughout the map on the floor.
You do not have to stand on these seals at the same time but they do need to be done in the correct order. To activate any player just needs to walk over it, If the correct it will light up, but if incorrect all they will reset and you will need to do it again until the correct order has been performed.
The order is not reset within the game and the first, second etc. will be the same all the time until you start a new game.