From AKBAN-wiki, the Martial Arts Database

In this posture 60% of the weight is on the rear leg, the leading leg is holding the body upright. The extended arm keeps safety distance from the enemy, and the other is ready to attack the enemy. Both hands are ready to intercept the attacker's advance. This posture fits a battle situation where one or both opponents wear a heavy armor or backpack Yoroi kumiuchi. When the ground is uneven and a fall is to be avoided at all costs this is one of the most useful postures.

This technique is part of Budo Ninjutsu Grade requirements syllabus Yellow belt grade requirements and of Black Belt grade requirements