wave behavior and fixed explosion

tools/IterableUtils.cs

@@ -0,0 +1,19 @@
+using System;
+using System.Collections.Generic;
+
+namespace Movementtests.tools;
+
+public static class IterableUtils
+{
+    private static readonly Random Rng = new Random();
+
+    public static void Shuffle<T>(this IList<T> list)
+    {
+        var n = list.Count;
+        while (n > 1) {
+            n--;
+            var k = Rng.Next(n + 1);
+            (list[k], list[n]) = (list[n], list[k]);
+        }
+    }
+}