Normal: You force an area to deny access to creatures. Crimson bars ward the area, appearing whenever someone tries to cross the border.

Unless you allow a creature to enter the area (an immediate action), it is held at bay outside the place. You likewise prevent creatures to leave the area, unless you allow it (an immediate action).

Reverse: At your will, a crimson vortex pushes all creatures in the area in the chosen direction.

You either force creatures towards or away from the center of the utterance. If you choose away, all creatures in the area move in a straight line directly away from the center until they reach the boundary of the utterance. If you choose towards, all creatures in the area are dragged towards the center, landing five feet from it, unless they were closer than that already. Either way, any creature impeded on its journey takes and inflicts damage as though it had fallen twice the distance it has moved, and moves past the obstruction if it is possible to move through its square. If not, the creature is pressed flat against the obstruction - tantamount to falling prone if they are against the floor. Then, the utterance fades and creatures fall as normal.