If there is a chance that your wounded animal could cross a property line. You being the hunter should have foreseen that possibility and requested permission from the neighboring land owner proir to the hunt. If the land owner will not grant you access, don't take a shot where and when there is a likely chance your animal could die in the no fly zone. Especially don't hunt on the property line like some people i know. Anyway stuff happens, but preparation is key. All you can do is try to avoid the issue the best way you can, and hope to make a clean fast kill every time.