This is the first time Psylocke appears in her Body armour. It is quickly put to the test, as she and colossus confront The Brood queen, in Harry Palmers body.
Before she has a chance to Probe his mind, while Colossus protects her, Harry reacts and Grabs him, then launches him at Psylocke. The two X-men are hurled and smashed though a wall, and fall 2 stories to the ground below. Colossus lands unharmed, but Psylocke is briefly stunned unconscious. Although the armour proved to protect her from physical attacks, she would still tend to be rendered unconcious from the trauma, even if only for short moments of time.
Source: cbr