dochugw(mon, X)

Reverse the sense of dochugw()'s new 'X' argument. Use True for the
usual case and False for the special case rather than the other way
around.

Call the special case variant when a monster teleports so that hero
stops occupation if the monster jumps to a position where it becomes
a threat.

src/teleport.c

@@ -1324,15 +1324,16 @@ rloc_to_core(
                   Monnam(mtmp),
                   next2u(x, y) ? " next to you"
                   : (distu(x, y) <= (BOLT_LIM * BOLT_LIM)) ? " close by"
-                  : (distu(x, y) < distu(oldx, oldy)) ? " closer to you"
-                  : " further away");
+                    : (distu(x, y) < distu(oldx, oldy)) ? " closer to you"
+                      : " further away");
         } else {
             pline("%s %s%s%s!",
                   appearmsg ? Amonnam(mtmp) : Monnam(mtmp),
                   appearmsg ? "suddenly " : "",
                   !Blind ? "appears" : "arrives",
                   next2u(x, y) ? " next to you"
-                  : (distu(x, y) <= (BOLT_LIM * BOLT_LIM)) ? " close by" : "");
+                  : (distu(x, y) <= (BOLT_LIM * BOLT_LIM)) ? " close by"
+                    : "");
         }
     }
 
@@ -1342,6 +1343,10 @@ rloc_to_core(
     if (resident_shk && !inhishop(mtmp))
         make_angry_shk(mtmp, oldx, oldy);
 
+    /* if hero is busy, maybe stop occupation */
+    if (g.occupation)
+        (void) dochugw(mtmp, FALSE);
+
     /* trapped monster teleported away */
     if (mtmp->mtrapped && !mtmp->wormno)
         (void) mintrap(mtmp, NO_TRAP_FLAGS);