HttT S15: Enhance the north corridor event

(cherry picked from commit d992b5b)

data/campaigns/Heir_To_The_Throne/scenarios/15_The_Lost_General.cfg

@@ -354,9 +354,32 @@
             y=1-23
             side=1
         [/filter]
+
+        [sound]
+             name=thunderstick.ogg
+        [/sound]
+        [delay]
+            time=200
+        [/delay]
+
+        # This dialog has several purposes:
+        # 1. Clue to the player that he's exploring in the right direction
+        # 2. Clue to the player to hurry up, in order to save Geldar
+        # 3. An excuse to play the thunderstick sound :)
         [message]
-            speaker=unit
-            message= _ "These passages seem to have been used recently."
+            speaker=Konrad
+            # po: "Timber!" is a call used to warn others that a tree is being felled.
+            # po: Konrad was raised in the Aethenwood.
+            message=_ "<big><i>Timber!</i></big>"
+        [/message]
+        [message]
+            speaker=Konrad
+            message=_ "<i>(looks abashed)</i> I do feel a fool. What was that?"
+        [/message]
+        [message]
+            speaker=Delfador
+            {DELFADOR_MENTORING}
+            message=_ "That can only have been a Dwarven thunderstick, Konrad. Our Knalgan allies must be in the thick of battle."
         [/message]
         [allow_undo][/allow_undo]
     [/event]
@@ -397,6 +420,8 @@
         [/filter]
         [message]
             speaker=unit
+            # TODO: mention some sounds coming from the cave-in? (Ostensibly,
+            # the sounds of the skeletons working to open the passage.)
             message= _ "There is a big cave-in south of here."
         [/message]
     [/event]