Oh i think i see. If you wanted a black body & scrolling stripes under it you would need the scrolling texture first, as the first pass, then put the black over the top as a second pass.
{
technique
{
pass
{
scene_blend alpha_blend
alpha_rejection greater 128
texture_unit
{
texture preset_2scroll.png
scroll_anim 0.0 0.1
}
}
pass
{
scene_blend alpha_blend
alpha_rejection greater 128
texture_unit
{
preset_2tail.png
}
}
}
}