What would I do?

Well, assuming I had a gun, which I don't and wouldn't, first I would have that gun loaded, just in case.

Second, if I felt that it was safe to drive that criminal in my car (it couldn't be an ordinary car, right?), then I would get him in, drive him 100 Km away, halfway I would tell him to throw out the knife, then I would tell him to get out, then drive back home.

No, I would not call the police - that would be excessive violence beyond what is required in self-defence.

leoj,

The incident that happened to me occurred not in my home
but in the street outside a tertiary institution and the
young bloke was not threatening in that -he did not frighten me
or assault me in any way. He was on drugs and wanted money
which I gave him. End of story.

I wish that you would stop putting your spin other people's
experiences, posts, et cetera - because you actually don't have a clue. You were not there.
Neither are you a lawyer - so you're in no position to give any
legal advice or tell any of us what the law would do.
Again - because you don't have a clue. your interpretations are
simply that - your interpretations - and according to your
post record on this forum they don't amount to much.

I also wish that you'd pick on somebody else for a change instead
of consistently singling me out. I know that you're a fan -
but really it's getting beyond a joke. Don't you care what
others have to say and what they post. Why choose me all the time.
I can't help but wonder why your obsession with me. It's
getting a bit embarrassing.

"I've been bailed up once before by a young man
who was drug-affected. It was at night and I
was on my way to an evening lecture. He demanded
money from me"

"The incident that happened to me occurred not in my home
but in the street outside a tertiary institution and the
young bloke was not threatening in that -he did not frighten me
or assault me in any way. He was on drugs and wanted money
which I gave him"

There is a slight difference between those two accounts.

Dear Is Mise,

No there isn't.

I simply did not elaborate in my first post.
The fact remains also that he did not take
all of my money - but left me enough to buy
coffee as I had requested - which to me showed
that there wasn't a serious threat in him.

//What would you have done?//

Release the hounds.

Foxy,

"I've been bailed up [indicates robbery with menaces] once before by a young man who was drug-affected. It was at night and I
was on my way to an evening lecture. He demanded [not asked nicely but demanded; demand indicates threat] money from me"

2nd version:
". He was on drugs and wanted [did not 'demand'?] money which I gave him"

There is a world of difference.