Tempo: 2.
DT: Evasion.
When another participant attempts to move past you, such as when trying to approach an ally positioned behind you, you may use a Reaction to move Adjacent to that opponent and attempt to halt your enemy. A successful Check forces the target of this Action to immediately stop moving.
Although this is a Risky maneuver, it does not invite risk from the target you intercept. Other participants you pass when you move, however, might take advantage of the opportunity.