avoid "You fall down a deep shaft!" if flying down

Fixes #1371

src/trap.c

@@ -608,6 +608,7 @@ fall_through(
     const char *dont_fall = 0;
     int newlevel;
     struct trap *t = (struct trap *) 0;
+    boolean controlled_flight = FALSE;
 
     /* we'll fall even while levitating in Sokoban; otherwise, if we
        won't fall and won't be told that we aren't falling, give up now */
@@ -653,12 +654,15 @@ fall_through(
         return;
     }
     if ((Flying || is_clinger(gy.youmonst.data))
-        && (ftflags & TOOKPLUNGE) && td && t)
+        && (ftflags & TOOKPLUNGE) && td && t) {
+        if (Flying)
+            controlled_flight = TRUE;
         You("%s down %s!",
             Flying ? "swoop" : "deliberately drop",
             (t->ttyp == TRAPDOOR)
                 ? "through the trap door"
                 : "into the gaping hole");
+    }
 
     if (*u.ushops)
         shopdig(1);
@@ -678,7 +682,9 @@ fall_through(
         }
         dist = depth(&dtmp) - depth(&u.uz);
         if (dist > 1)
-            You("fall down a %s%sshaft!", dist > 3 ? "very " : "",
+            You("%s down a %s%sshaft!",
+                controlled_flight ? "fly" : "fall",
+                dist > 3 ? "very " : "",
                 dist > 2 ? "deep " : "");
     }
     if (!td)