An exemplary method is provided for managing and mitigating security risks through planning. The superior and inferior bone contacting members include at least two bone contacting components interconnected via one or more lateral wire nettings such that the implant is vertically and laterally expandable in situ from a first insertion configuration to a second expanded configuration. A fuel is then injected so as to penetrate the shear layer for enhanced mixing. In the forming of the barrier wall, a height on a gap side in a direction vertical to the first substrate becomes lower than a height of a center portion. This spillway is configured to separate the sheet from the melt.