This phenomenon is caused when one player repeatedly moves back and forth along a line to increase line velocity
. It can be quite dangerous if practiced on the Circle line as the result can mean that a player is performing a whole circuit or more in a single move, making it impossible for any other players to break out of zone one, or any area boundaried by the circle. This often ends in stalemate as to change lines, the circling player must slow down enough to change lines, thus allowing other players to escape from the boundaried area.
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