Arm Bar of Standing Opponent from Ground

Setup:
Assume full guard.
Opponent is in upright position.
Opponent stands.

Actions:

1. Retain hold with legs.  
2. Immediately hook your own arms around opponent's leg
3. Bridge, knocking opponent to the ground.
4. Mount opponent
5. Opponent will attempt to get up.
6. Place your own left foot slightly back
7. Capture opponent's supporting arm and pull across chest.
8. Swing foot in front of opponent's head to enable Arm Bar; bridge.