Actually, William Tyndale is my favorite martyr. But the prophecy of Jan Huss wasn't a teaching, it was what he said right before they killed him. Now if you go by the holy Bible, it does tell us how to judge a prophet and his prophecy. It's written in Dueteronomy,
Deu 18:20-22 KJV
(20) But the prophet, which shall presume to speak a word in my name, which I have not commanded him to speak, or that shall speak in the name of other gods, even that prophet shall die.
(21) And if thou say in thine heart, How shall we know the word which the LORD hath not spoken?
(22) When a prophet speaketh in the name of the LORD, if the thing follow not, nor come to pass, that is the thing which the LORD hath not spoken, but the prophet hath spoken it presumptuously: thou shalt not be afraid of him.
So if you really are going by the Holy Bible, then that bible also acknowledges that there may be also be prophets, and you should judge by whether the prophecy is fulfilled. Jan Huss said that they were about to roast him, but in one hundred years there would be a swan that they would be unable to cook. The prophecy was fulfilled. Martin Luther was never killed by the Roman church, although because they didn't try.
This does not mean to say that Martin Luther was perfect, or even correct in all things, but it does imply that God did have some purpose for him.