The process of pseudorotation occurs when the two axial ligands close like a pair of scissors pushing their way in between two of the equatorial groups which scissor out to accommodate them. Both the axial and equatorial constituents move at the same rate of increasing the angle between the other axial or equatorial constituent.
The process of pseudorotation happens when two axial ligands squeeze between two equatorial groups, pushing them out of the way. Both axial and equatorial components shift at an equal pace to increase the angle between each other.