Assalamu alaikum dear brother Uzair,
I hope this hasn't got too old to answer
1. I have heard some stories about that but they somehow sounded ridiculous to me. The main purpose of satan is to take men away from the right path, not to kill them. If he or his 'disciples' kill a man, that man will be a shaheed (if he is a muslim) and will go to heaven easily, which will actually be a great loss for satan!
But sura namal 27:17 says the army of Solomon (A) was made up of men, Jinns and birds. So this means jinns do have the ability to kill men, right? Or else what is their use in the army!!
But still, they are beings like us, having intelligence, imotions etc. So it won't be surprising if a jinn kills a man or frightens him out of rage or anger. But not like any horror movie. They can simply enter your body and take your upside down. But the stories I heard were like horror movies.
2. Yep, ur teacher is right. Read the hadith.
"Prophet SAWS said: There r three kinds of Jinns. One kind always keeps flying in the sky, the second kind exists in forms of snakes and dogs, the third kind keeps going towards the earth or lives on earth and inspite of living in one place they travel here and there without purpose."
I took this from Bilal Phillip's book, "The Fandamentals of Tawheed", and the only reference given there is
Collected by At-Tabari and Al-Hakim, so IS can't be more specific dear brother, sorry
Allah Hafeez,
Tahmeed