"...he didn't know it was wrong to handcuff a man he didn't recognize in his yard."

I have to wonder what thought processes were going through these people's minds. If you find a stranger in your yard do you:

A: Politely ask, "Excuse me, but who are you and what are you doing in my yard?"
B: Yell, "Hey get your butt out of my yard!"
C: Get a friend to wrestle with the stranger and handcuff him. You also tell the stranger he's under arrest. By the way you aren't not a police officer.
D: BANG!

I don't know how bad the crime problem in Michigan City is. Luckily for the man Option D wasn't selected when he took the wrong way to find his friend's house. As of Monday the homeowners were charged with criminal confinment (Class D felony) and battery (Class A Misdemeanor).

Here is your free legal advice for the day: don't attempt to perform a citizen's arrest.