I tracked a man because he was stalking my friends.
What happened, why do you think he's stalking your friends?
He was following them for a little while.
It's understandable to want to protect your friends. Taking action to keep others safe is usually a good thing, so long as you're careful.
I had no choice since he scared multiple women in my life. I want him arrested.
You sound like a very protective friend, which is a great quality to have as a person. If he does anything else suspicious, you should definitely call the police!