Ultima Online Protocol :: Block Movement
Packet # Packet Name Length Client Server Obsolete
0x21 Block Movement 0x0008 X X
Data Type Description
byte 0x21 The packet number.
byte Sequence The movement sequence that was blocked.
ushort X The X-axis position to jump back to.
ushort Y The Y-axis position to jump back to.
byte Direction The direction (C#|VB7) the player was facing.
byte Z The Z-axis position to jump back to.

Packet Description:
This is sent by the server to reject a movement request.

Note that sending this packet will reset the client's movement sequence to zero.