[sPlOrYgOn]

thats because the if statement is only for
pBot->f_move_speed = 0.0;
the other stuff will always run.
instead have it

   if (pBot->f_duck_time > gpGlobals->time)
    {
      pBot->f_move_speed = 0.0;
      pBot->f_duck_time = gpGlobals->time + 1.5;
      FakeClientCommand(pEdict, "say", "DUCKING", NULL);
      pEdict->v.button |= IN_ATTACK;   // fire the weapon
      return TRUE;
    }