May you have peace!
As someone else said, you're not looking at this in its proper context. The point of the verse is that if you call down evil upon anyone "superior" to you, even someone "bad," you risk it getting back to them... to your own detriment. Even if you think you're doing so in private. Indeed, you may even believe you're only revealing it to a true confidant (i.e., spouse, lover, etc.), but for some things in this world, there really is no privacy at all. Why? Because there are those existing who would rather see you come to your end... as opposed to a bad superior being brought low... and so will make sure that he comes to know of it. They are called "demons"... or bad spirit beings. "Flying creatures"... "owning wings." And they will seek to bring you down... versus bringing down a bad superior... because such superior serves their interests (i.e., waging war with the Woman's seed)... which seed you may be a part of. They don't know... and they don't care - if there's even a possibility (i.e., you are seeking, asking, knocking... in any way), you will be a target.
The reason Mr. Van Impe... and others, including, possibly, you... mistake the word to mean a "bird" is because certain Bible versions use the wrong transliteration of the Hebrew word `owph, which means "flying creatures," "fowl," "insects," OR "birds." Because those who claim to know lean on their own understanding, they don't understand that there are flying creatures that are NOT fowl, insects or birds. Instead, they assume[d] that it was only one of these, because those are the only "flying creatures" they are aware of. And they assume it is a bird because, unlike insects and fowl, birds were often used to send communications (i.e., carrier pigeons, etc.)
But the word was NOT intended to denote a bird, but a flying "creature"... literally... which is what spiriti beings are. They are seraphs, all of them, good OR bad: fiery, flying, flesh-eating creatures (saraph).
Most "scholars" do not know/understand this, however, because most do not discern the spirit realm but only those things that of this realm (i.e., the physical universe). And that is the problem with many who put their faith in "the Bible": rather than following the Holy Spirit, Christ, and letting HIM teach them ALL things... they walk by sight, interpreting what is written according to the knowledge of the FLESH... instead of interpretating what is written using the knowledge of the SPIRIT (which requires faith).
I bid you... take care: we have but ONE Master and ONE Leader and ONE Teacher, Christ. There is no other and when we allow ourselves to be led along by the teachings and propoganda of others, we once again risk be led... away from God.
I bid you peace... and ears to hear the Spirit, if you so wish it.
A slave of Christ,
SA