I am talking about this with you because I consider it important to understand what 'prophesying' is. The one long chapter of the Bible that tells us what to in church instructs believers to 'let the prophets speak two or three.'
Look up the word 'prophesy' and variants like 'prophecy' and 'prophesying' in a concordance. What examples do you find of someone complaining about themselves being hit, or other things like that are called prophecy? Prophets typically spoke utterances in the first person for God, starting with such phrases as 'Thus saith the LORD.' Not all prophecies are in this form. But prophecies are messages from God, and we might say that the architypal prophecy is a quote from God in the first person. A number of the examples where 'prophesy' is used in the Old Testament happen to be predictions of the future, also.
I showed you the passage in Exodus where Yahweh told Moses that He was the one who made a man mute or able to speak.
Exodus 4:11
And the LORD said unto him, Who hath made man's mouth? or who maketh the dumb, or deaf, or the seeing, or the blind? have not I the LORD?
Since God enables us to speak, are we all prophesying all the time? God did not make Adolf Hitler a lifelong mute. Does that make his speeches into prophesying?
YHWH opened the mouth of a donkey to be able to speak
Numbers 22
28 And the LORD opened the mouth of the ass, and she said unto Balaam, What have I done unto thee, that thou hast smitten me these three times?
Yahweh gave the donkey the ability to speak. It does not say here that the Spirit of the Yahweh moved the donkey to speak a message from Yahweh. The donkey does not say, "Thus saith the LORD" and speak for God in the first person. There is nothing in the passage that says the donkey is prophesying.
God has given you the ability to speak. If someone were hitting you, and you didn't fight back, a possible reaction, you as a human, might have, is to ask, 'Why did you hit me?' That doesn't mean you are prophesying.
The II Peter passage says 'spake as they were moved by the Holy Ghost' or more literally 'were carried along by the Holy Ghost.' The passage does not say that the Spirit moved the donkey to speak certain words. The donkey was given the ability to speak-- it's mouth was open.
Another verse does exist where a mouth was opened. Zecharias was mute when he demanded a sign about John's birth. When he wrote 'His name is John' after the baby was born, his mouth was opened... meaning he wasn't mute anymore. But in Zecharias case, he was filled with the Spirit and prophesied after this. But the passage does not say this about the donkey when his mouth was opened.
The donkey did not tell Balaam about the angel, not according to what is recorded in the passage. The donkey saw the angel, but asked Balaam why he was hitting him and asked if she'd ever done anything like that before. Then the LORD opened Balaam's eyes and he saw the angel.
If the Bible actually taught it, that would convince me. If this were a prophecy, in what way do you think Balaam were hitting the LORD?