crude approximation, but it works.

OpenRa.Game/Effects/Demolition.cs

@@ -0,0 +1,34 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using OpenRa.Game.Traits;
+
+namespace OpenRa.Game.Effects
+{
+	class Demolition : IEffect
+	{
+		Actor attacker;
+		Actor target;
+		int delay;
+
+		public Demolition(Actor attacker, Actor target, int delay)
+		{
+			this.attacker = attacker;
+			this.target = target;
+			this.delay = delay;
+		}
+
+		public void Tick()
+		{
+			if (--delay <= 0)
+				Game.world.AddFrameEndTask(w =>
+				{
+					w.Remove(this);
+					target.InflictDamage(attacker, target.Health, Rules.WarheadInfo["DemolishWarhead"]);
+				});
+		}
+
+		public IEnumerable<Renderable> Render() { yield break; }
+	}
+}