Well, actually, you probably did guess correctly:

In Mannheim, Germany, a German nationalist group was peacefully protesting when they were attacked by an apparent Islamist terrorist with a knife. Two of the Germans wrestled the attacker to the ground and had him subdued until the police ran up and liberated the Good Guy (the pro-Muslim attacker) from the Bad Guys (the pro-German victims).

After all, haven’t you been following the news about who are the Good Guys and who are the Bad Guys?

Freed, the pro-migrant Good Guy immediately stabbed a police officer, as seen above.

[Comment at Unz.com]