Prevent normal passage in a specific direction, whether it's to extort some Marks out of some chump or to set them up for a suckerpunch, this'll do the job. Use UNBAR to stop barring.

Skill: Guile
Group: Underbelly tricks
Command: GUILE BAR <DIRECTION>
Known: No
Lessons: 75 Lessons
Ability type: Combat utility
Can target: Others
Base balance time: 3.00 seconds