Firestorm & Shrapnel

"The Scatter distance of Blasts is limited by Walls and Doorways."

Blast Markers cannot scatter through Wall Terrain or Doorways in the Closed State. If a Scatter roll takes a Blast Marker's centre point into contact with a Wall or Door in a Closed State, the Blast Marker scatters only as far as the point where its centre contacts the edge of the Wall or Doorway in the Closed State. Resolve the Weapon's effect from that spot.

If a line cannot be drawn between any point of the Base of a Model hit by a Blast Marker or Template and the centre of the Blast Marker (or any point of the Base of the Model making the attack in the case of a Weapon that has the Template Special Rule) that does not pass through a Wall or Doorway in the Closed State, then that Model is not hit by the attack.