Shoot a Super at the wall, while the Geemer is moving vertically. If it is on the bottom of the shot blocks, it will not fall.

Requires:

{
  "enemyDamage": {
    "enemy": "Geemer (blue)",
    "type": "contact",
    "hits": 1
  }
}
"h_ZebesIsAwake"
{
  "ammo": {
    "type": "Super",
    "count": 1
  }
}